Outsourcing sip projectcông việc

Bộ lọc

Tìm kiếm gần đây của tôi
Lọc theo:
Ngân sách
đến
đến
đến
Loại
Nhiều kỹ năng
Ngôn ngữ
    Tình trạng công việc
    2,000 outsourcing sip project công việc được tìm thấy, giá theo USD

    i have APC company in Saudi Arabia licensed in management consulting and i have signed a contract with GHM company (Saudi Company) to provide consulting services and consultants outsourcing and based on the above contract i want to enter in a new contract (sub contract) with ZXC company whic is based on london to provide 10 consultants to work with my saudi client so i want a legal expert to help me drafting the contract with the ZXC

    $123 (Avg Bid)
    $123 Giá đặt trung bình
    25 lượt đặt giá

    A somatosensory interactive Parkour game, scene original painting, scene modeling, character original painting, character modeling and character animation need to be outsourced

    $1059 (Avg Bid)
    $1059 Giá đặt trung bình
    18 lượt đặt giá

    We want to help in making the world a better place, one problem solved at a time – all powered by solutions tailored to streamline operations, drive innovation, delight customers, and build brand recognition. At the end of the day, we only have one job – and that's to help businesses deliver better to their customers.

    $18 (Avg Bid)
    $18 Giá đặt trung bình
    3 lượt đặt giá
    TAXATION AND ACCOUNTING -- 2 Đã kết thúc left

     GST Registration  GST Return filing  ITR  Book Keeping  outsourcing accounting services  MSME Registration  DSC (Signature/Token)  Company Registration/Partnership  Food license  Trademark  Amendment, GST, TDS  Udyam Registration  Gem Registration  Registration Under Shop  Director Identification Number (DIN)  Tax Deduction Account (TAN) Registration  Nidhi Company Registration  Section 8 Company Registration  Balance Sheet & Profit Loss Account  CA Certification  Monthly - Accounting Package  Yearly - Accounting Package  Income Tax Audit  Trademark Registration

    $295 (Avg Bid)
    $295 Giá đặt trung bình
    35 lượt đặt giá
    TAXATION AND ACCOUNTING Đã kết thúc left

     GST Registration  GST Return filing  ITR  Book Keeping  outsourcing accounting services  MSME Registration  DSC (Signature/Token)  Company Registration/Partnership  Food license  Trademark  Amendment, GST, TDS  Udyam Registration  Gem Registration  Registration Under Shop  Director Identification Number (DIN)  Tax Deduction Account (TAN) Registration  Nidhi Company Registration  Section 8 Company Registration  Balance Sheet & Profit Loss Account  CA Certification  Monthly - Accounting Package  Yearly - Accounting Package  Income Tax Audit  Trademark Registration

    $300 (Avg Bid)
    $300 Giá đặt trung bình
    5 lượt đặt giá

    ...of the expertise we need, and the problem we are facing at the moment. Required Skill-set : 4-5+ years of hands-on experience in C++, C#. Exp in Building 3rd party libraries in C++ Strong proficiency in Visual Studio - 2015/2017, MSYS2, CMake Experience in integrating C++ application with C# Thorough knowledge of VOIP calling application development Understanding of SIP protocol Console/ WPF app-building expertise Current Project Requirement: The primary need is to replace the Opal library with the Linphone library to make few webcams compatible with VOIP calls. To cater to the above, we need to build linphone SDK and create DLLs Further, an internal C++ console application is to be built to have all the VOIP functionalities along with an interface layer to access this in...

    $20 (Avg Bid)
    $20 Giá đặt trung bình
    1 lượt đặt giá

    Hello, I have an existing test site that needs modifications. Preferred developer should have expertise in PHP/MySQL, Smarty and JavaScript. I am seeking a dev that can perform fast work, good documentation and clean code. No outsourcing. I prefer to work directly with the developer.

    $459 (Avg Bid)
    $459 Giá đặt trung bình
    72 lượt đặt giá

    ...the expertise we need, and the problem we are facing at the moment. Required Skill-set : 4-5+ years of hands-on experience in C++, C#. Exp in Building 3rd party libraries in C++ Strong proficiency in Visual Studio - 2015/2017, MSYS2, CMake Experience in integrating C++ application with C# Thorough knowledge of VOIP calling application development Understanding of SIP protocol Console/ WPF app-building expertise Current Project Requirement: The primary need is to replace the Opal library with the Linphone library to make few webcams compatible with VOIP calls. To cater to the above, we need to build linphone SDK and create DLLs Further, an internal C++ console application is to be built to have all the VOIP functionalities along with an interface layer to access this ...

    $306 (Avg Bid)
    $306 Giá đặt trung bình
    1 lượt đặt giá

    ...2015/2017 and someone with some console/WPF app building expertise too.... Required Skill-set : 4-5+ years of hands-on experience in C++, C#. Exp in Building 3rd party libraries in C++ Strong proficiency in Visual Studio - 2015/2017, MSYS2, CMake Experience in integrating C++ application with C# Thorough knowledge of VOIP calling application development Understanding of SIP protocol Console/ WPF app-building expertise Current Project Requirement: The primary need is to replace the Opal library with the Linphone library to make few webcams compatible with VOIP calls. To cater to the above, we need to build linphone SDK and create DLLs Further, an internal C++ console application is to be built to have all the VOIP functionalities along with an interface layer to acces...

    $669 (Avg Bid)
    $669 Giá đặt trung bình
    3 lượt đặt giá

    ...outstanding website: 1) creative website for HR outsourcing services, an old concept but new to the maritime industry 2) complete creative content (well researched, i will provide the information on the project, but need to do bit more research to come up with out of the box thinking with how we portray on the website) that talks maritime language (Australian English/Slang) and stays outstanding to cover the main points like current pain points, what we do different to tackle them, our vision, mission, team, know our services, how we deliver services, meeting booking, future space for clients & reviews & anything that makes us stand out of the rest by using creative images and simple straight forward information. Need samples of your recent project on ...

    $318 (Avg Bid)
    $318 Giá đặt trung bình
    65 lượt đặt giá
    Salesperson for Spain Đã kết thúc left

    Vparagon is a sales outsourcing company that sells on behalf of its clients their products and services in new markets. Our client is a well-established French company active in the Optometry sector. We want a salesperson to call Optical stores in Spain, explain our solution and book a meeting with our client's representatives. YOU MUST BE NATIVE SPANISH SPEAKER We are searching for salesmen/women that would like to have a long-term collaboration with a serious and friendly company that is growing every year in the sector. Our ambition is to start with you in sales and develop yourself to a project manager in the mid-term future. The role is Sales. What we are searching: a. For fighters, people that don’t take no as an answer, are professional and are willing...

    $20 / hr (Avg Bid)
    $20 / hr Giá đặt trung bình
    6 lượt đặt giá
    Build a SIP softphone -- 2 Đã kết thúc left

    We have an asterisk server at our HQ and we have sip phones in our branch offices. We want to Develop a SIP softphone that we customize with our brand and users can install in their windows, mac, ipad, android etc....We need to do voice and video calls with the softphone.....something like LinePhone and Zoiper.

    $525 (Avg Bid)
    $525 Giá đặt trung bình
    6 lượt đặt giá

    I am working for a client. He is running a youtube channel and a website for online share traders. My client needs a SIP Calculator on his wordpress website. - Refer attached file for calculator layout and features. He is ready to spend some money for his wordpress website feature add-on.[ SIP Calculator ] Very Good PHP Developres with good knowledge on Financial Accounting / Investment / Share Trading can come forward and apply for this Job. Candidate selection based on Test Cases submitted for the uploaded file.

    $14 (Avg Bid)
    $14 Giá đặt trung bình
    6 lượt đặt giá
    Social Media Marketing and SEO Đã kết thúc left

    I am a passionate and dynamic professional SEO Expert. I can do Web Research, Lead Generation and Social Media Marketing. I have completed one year of professional SEO and digital marketing courses from an outsourcing institute in BD. After completing my courses, I have been involved in many practical projects. I can promote any business or product worldwide or in any specific area. I can understand customer attitude. To create attractive and effective web content to promote any product. I can work with full liability for a large organization, follow the business privacy.

    $44 (Avg Bid)
    $44 Giá đặt trung bình
    2 lượt đặt giá

    Vparagon is a sales outsourcing consultancy based in Barcelona Spain. Our client is a world-known brand for Gas Engine machines. We are searching for an experienced salesperson to call the US market, speak with the appropriate Decision Makers within the organizations of interest and provide us a. with specific information required b. Book a Discovery call between them and our client. You have to be an experienced salesperson, preferably American, and if you live in the US or in a US timezone even better. Start your application with the code "infinity204"

    $19 / hr (Avg Bid)
    $19 / hr Giá đặt trung bình
    6 lượt đặt giá

    Generate leads from Us businesses interested to outsource bookkeeping, data entry, and software development.

    $370 (Avg Bid)
    $370 Giá đặt trung bình
    17 lượt đặt giá

    I am looking for a lawyer to make certain documents. - SLA - Project Outsourcing and consignment - Contract and hourly employees - Part-time employees

    $7 / hr (Avg Bid)
    $7 / hr Giá đặt trung bình
    2 lượt đặt giá

    A draft proposal is attached. The task involves two aspects...task involves two aspects: and improve the attached proposal, spell check, improve the marketability of the proposal. The document should be reviewed for grammar and spelling, and the information within the document improved. 2. Develop factsheets relating to the following areas, in the same kind of vein as the proposal for the following areas: Supply Chain, Logistics, Technology, Outsourcing, Tendering (your suppliers), Tendering (your customers), Cost Reduction, Growth, Contract, Advisory Their should be a brief "Fact Sheet" developed on each of these, between half a page, and one page in length for each category. These should be written in the format suitable for flyers and website content Any questions...

    $90 (Avg Bid)
    $90 Giá đặt trung bình
    27 lượt đặt giá
    Article about Outsourcing Đã kết thúc left

    Here is the offer for the work we discussed. Feel free to ask any question

    $40 (Avg Bid)
    $40 Giá đặt trung bình
    1 lượt đặt giá

    OUTSOURCING BRIEF Create As-built Vectorworks Model of House & Site from LAZ Point Cloud SCOPE I'm looking for an intermediate to experienced draughtsperson to create a 3D as-built model of an existing two-storey house, studio, and site. The model is to be in Vectorworks Architect 2020, and the source data is a LAZ point cloud file that encompasses the whole of the site, house, and studio inside and out. Previous experience with modelling from point cloud data is essential. The scope consists of 3 components, which I suggest is modelled as 3 separate files: 1. House (200 sqm footprint, 8m to roof ridge) 2. Studio (35 sqm footprint, single storey, 4 m to ridge) 3. Site (1100 sqm area, sloping, 5m falls corner to corner) CONTEXT This scope forms a part of a wider proje...

    $12 - $18 / hr
    $12 - $18 / hr
    0 lượt đặt giá
    LOGO DESIGN Đã kết thúc left

    Looking logo for outsourcing company submit your sample to get milestone. Company Name : ESROT TECH PTV LTD. Tag Line : Strategic Sourcing Partner

    $41 (Avg Bid)
    $41 Giá đặt trung bình
    31 lượt đặt giá

    ...excluding depreciation and apportionment, based on annual cash flow, including capital and operating expenses 2. Comparison of per capital IT investment 3. Comparison of IT CAPEX investment and IT OPEX investment 4. IT staff's contribution to the total IT investment (IT staff's contribution refers to the full-time staff wages, benefits and other staff costs) 5. Comparison of outsourcing services in % of Total IT investment (outsourcing services refers to all the relevant support provided by suppliers, including performing specific tasks and completing contracts) 6. Comparison of hardware investment in % of Total IT investment (hardware investment refers to the total asset value of all hardware purchased in the current year, including license fees, maintenance cos...

    $1833 (Avg Bid)
    $1833 Giá đặt trung bình
    20 lượt đặt giá
    Commission-only sales agents Đã kết thúc left

    Hi, We are Innovature Consulting, a BPO company in Vietnam providing Finance/ Accounting, Call Center and Post Production outsourcing services to clients in North America, Australia and EU markets. We are looking for commission-only sales agents to partner with us? Each project will have a minimum value of $3000 and the commission for sales agent is 10%.

    $2071 (Avg Bid)
    $2071 Giá đặt trung bình
    7 lượt đặt giá
    Introduce our company Đã kết thúc left

    ...AGENCY IN VIETNAM OUR BACKGROUND TSC is a brand of JT1 - Leading Tech Recruitment Agency in Vietnam. To meet the investor demand, TSC launch as an extra service to well serve Tech companies worldwide. We focus mainly on Software Engineer Staffing services for the markets of Hong Kong, Australia, and Singapore that are wishing to build a team of high-quality personnel in Vietnam. With an IT Outsourcing team with high professional skills and good English proficiency, TSC is always ready to assist in completing short/long-term projects. We also provide other services such as Payroll, Staffing. OUR SERVICES STAFFING TSC is responsible for recruiting employees, undertake other related issues such as salary, social insurance, and benefits for employees according to the provisions ...

    $27 (Avg Bid)
    $27 Giá đặt trung bình
    5 lượt đặt giá

    DO NOT APPLY WITHOUT READING THE FULL DESCRIPTION!! -------------------------------------------------------------------------------------------- Experience Level: Expert (Minimum 5+ years) Dedicated resource is required on a permanent basis for one of our clients! The engagement can carry over for months or years depending on mutual acceptance between the developer and the client. + Minimum 5+ yrs of working experience + Only companies and resources from INDIA + Excellent communication skills Terms: 1. Full-time requirement 2. 8 hrs dedicated work from Monday to Friday (8 X 5 = 40hrs per week) 3. 14 days notice period for first 2 months, 1 month notice period from 3rd month onwards. Check the enclosed requirement matrix properly before applying. Apply if you are confident of justifying y...

    $460 - $920
    $460 - $920
    0 lượt đặt giá

    ...integrated into client's CRM. Now we are facing challenges for the following steps. Challenge 1: You know, in India VoIP is quite restricted than other countries. We don't have infrastructure or access to the direct telecom network so we can easily terminate the call in our customer's PBX. Help us to find out cheapest and best Indian SIP enabled DID provider for both outgoing and incoming calls. That virtual number should be terminated at our IP PBX with SIP trunk. Rest we will do at our PBX end. I know this can also be achieved by getting PRI line from telecom operator. But we don't want to use PRI line due to extra hardware cost and call quality. Challenge 2: Find us the cheapest and best India and International VoIP call provider separately. Integr...

    $641 (Avg Bid)
    $641 Giá đặt trung bình
    3 lượt đặt giá

    We are a startup Company looking for a "Business Development Manager" who can help us to search for a BPO projects like Data Entry, Inbound or outbound voice process and chat process. He should have knowledge and experience in outsourcing these projects.

    $610 (Avg Bid)
    $610 Giá đặt trung bình
    9 lượt đặt giá

    Need to integrate existing Mitel (md-one) pabx with a new Pabx via E1. Basic call functionalities (caller name / number / forwarding and hold features) between two pabxs should present after integration.

    $27 / hr (Avg Bid)
    $27 / hr Giá đặt trung bình
    2 lượt đặt giá

    Need help to set up our 3CX phone system, linking a local Lan Dinstar Gateway and another remote one that has no public IP, there are 10 extensions to create, incoming and outgoing call routes, music on hold and maybe adding another sip trunk for local US calls, depending on options, Expertise with networking and 3CX is a must.

    $118 (Avg Bid)
    $118 Giá đặt trung bình
    3 lượt đặt giá
    Python/Flask developer needed Đã kết thúc left

    I am looking for a Python/Flask developer who can work on several assessments. Only need an individual expert!!! Not team or outsourcing man... More details will be shared on the chatbox.

    $155 (Avg Bid)
    $155 Giá đặt trung bình
    23 lượt đặt giá

    Need a expert asterisk developer to work consistat on numerous projects must have he must have experience of 5 years minimum work experience on asterisk dial-plans Work experience in asterisk odbc connection Work experience on SIP protocol Chanspy and other areas

    $633 (Avg Bid)
    $633 Giá đặt trung bình
    19 lượt đặt giá

    We are looking for talented developer who can build a voicemail and collectcall system over SIP protocol. We prefer using Restcomm Open Source code for voice, video and messaging capabilities into business workflow.

    $3000 - $5000
    $3000 - $5000
    0 lượt đặt giá
    Brandname for consulting firm Đã kết thúc left

    The project requires a branding expert to recommend four to five good brand names for a consulting firm that is interested in rebranding itself. The firm is engaged in consultancy in the fields of tax, outsourcing, technology, M&As and finance. The recommended names should not contain any of these words (tax, technology... finance) and instead should be a general word-mesh that inspires confidence in clients as regards the firms capabilities, smartness, and reliability (example - Accenture). A few more important points: 1. The brandname should be easy to spell, pronounce and remember. 2. It should not begin with A, K or M. 3. It should not have any awkward / funny meaning in Japanese, German, French or Spanish. 4. Before submitting the brandname, please check the av...

    $75 (Avg Bid)
    $75 Giá đặt trung bình
    6 lượt đặt giá

    ...progress, don’t want to wast two parties time, please check you have skill to complete this job : ability is insufficient, the project will be cancelled and no pay but disput ,If necessary, the code you wrote will be published. problem, front-end team will discuss with you until it is completed. very well, it will become our long-term outsourcing, thank you 【Project Demand 】 The project is to convert Wireframe to ReactJS file, we have completed five main pages and UIKits XD files. As long as it is converted into the corresponding ReactJS pages according to Wireframe. Also must have RWD All wireframe screenshot like attach file. 【Project target 】 1. Use react-material to implement components. 2. Use react-material JSS for styling. 3. Use reac...

    $340 (Avg Bid)
    $340 Giá đặt trung bình
    17 lượt đặt giá

    ...insufficient, the project will be cancelled and no pay but disput ,If necessary, the code you wrote will be published. problem, front-end team will discuss with you until it is completed. very well, it will become our long-term outsourcing, ,thank you Project Demand : The project is to convert XD file to ReactJS file , attach file is XD file. Project target : 1. Use react-material to implement components without bootstrap. 2. Convert CSS to JSS 3. Use react-material grid system to sort out pages. 4. You don’t need to code buttons, input field, slider etc. We’ll provide all basic components. 5. You shouldn’t install any dependencies if needed please tell us. 6. We’ll provide animation utils and you only need to call function ...

    $56 (Avg Bid)
    $56 Giá đặt trung bình
    18 lượt đặt giá

    Hi, we are a firm of Chartered Accountants based out of Delhi, India. We are looking someone for marketing our firm in US domain and looking out for some good consultant for getting us connected with US CPA Firms/ US Business owners for getting their accounting, etc work outsouced to India.

    $52 (Avg Bid)
    $52 Giá đặt trung bình
    2 lượt đặt giá
    Project for Muhammad U. Đã kết thúc left

    Hi Muhammad U. Are you able to help me with my project using Cplex for resource allocation? The objective function is to minimize the outsourcing of jobs to outside companies. All the hours needed by each specialization for each project are in the excel file . Along with the number of employee for each specialization and the rates.

    $53 (Avg Bid)
    $53 Giá đặt trung bình
    1 lượt đặt giá

    ...integrated into client's CRM. Now we are facing challenges for the following steps. Challenge 1: You know, in India VoIP is quite restricted than other countries. We don't have infrastructure or access to the direct telecom network so we can easily terminate the call in our customer's PBX. Help us to find out cheapest and best Indian SIP enabled DID provider for both outgoing and incoming calls. That virtual number should be terminated at our IP PBX with SIP trunk. Rest we will do at our PBX end. I know this can also be achieved by getting PRI line from telecom operator. But we don't want to use PRI line due to extra hardware cost and call quality. Challenge 2: Find us the cheapest and best India and International VoIP call provider separately. Integr...

    $140 (Avg Bid)
    $140 Giá đặt trung bình
    1 lượt đặt giá

    Hi Bernardo F., I noticed your profile and would like to offer you my project. We can discuss any details over chat. I need a CPLEX code for a resource allocation project I am working on. The objective function is to minimize the outsourcing of jobs to outside companies. All the hours needed by each specialization for each project are in the excel file . Along with the number of employee for each specialization and the rates.

    $47 (Avg Bid)
    $47 Giá đặt trung bình
    1 lượt đặt giá

    Hi Kevin A., I noticed your profile and would like to ask your help if you can. I need a CPLEX code for a resource allocation project I am working on. The project is about allocating employees to certain projects in a cloud computing company. The employees are divided into different specializations. Each project requires different specialization and different hours of work by each specialization to complete the project. The objective function is to minimize the outsourcing of jobs to outside companies. All the hours needed by each specialization for each project are in the excel file . Along with the number of employee for each specialization and the rates. Please contact me for more details on the requirements

    $50 (Avg Bid)
    $50 Giá đặt trung bình
    1 lượt đặt giá
    CPLEX - resource allocation. Đã kết thúc left

    Hello, I need a CPLEX code for a resource allocation project I am working on. The project is about allocating employees to certain projects in a cloud computing company. The employees are divided into different specializations. Each project requires different specialization and different hours of work by each specialization to complete the project. The objective function is to minimize the outsourcing of jobs to outside companies. All the hours needed by each specialization for each project are in the excel file . Along with the number of employee for each specialization and the rates. I have attached the .mod and .dat code that I tried to start. Please contact me for more details on the requirements.

    $31 (Avg Bid)
    $31 Giá đặt trung bình
    2 lượt đặt giá

    We are medical billing Outsourcing company, registered in Wyoming. We need a person who has medical billing/ RCM background or have link with doctor/hospital so that they can mediate for us and bring business.

    $23 / hr (Avg Bid)
    $23 / hr Giá đặt trung bình
    3 lượt đặt giá
    SIp VPN , Open VPN centos 7 Đã kết thúc left

    I need you to build SIp VPN , Open VPN centos 7.

    $25 (Avg Bid)
    $25 Giá đặt trung bình
    5 lượt đặt giá
    Cisco 2900 Đã kết thúc left

    Hi I am search Cisco specialist who knows Cisco 2900. I need to configure it for avoid problems with SIP. For example INVITE message coming without SDP, is it possible to include it? Second question is that NAT information inside SIP packets like rport. Is there is any settings at cisco when we can add rport; value. Thanks.

    $29 / hr (Avg Bid)
    $29 / hr Giá đặt trung bình
    13 lượt đặt giá

    We are a START Company looking for a Business development manager who can help us to search for a bpo projects like data entry,inbound or outbound voice process and chat should have knowledge and experience in outsourcing these projects. [Removed by Freelancer.com Admin for offsiting - please see Section 13 of our Terms and Conditions]

    $596 (Avg Bid)
    $596 Giá đặt trung bình
    4 lượt đặt giá
    Morning sip Đã kết thúc left

    Morning sip is a tea brand i want logo

    $254 (Avg Bid)
    $254 Giá đặt trung bình
    16 lượt đặt giá
    Reddit post Outsourcing Đã kết thúc left

    I am looking for a freelancer to post a post for me 4 times a day in 60-70 subreddits each on Reddit. You will receive the content from us. The post would have to be posted at 10pm, 3am 7pm 1pm German time each time. Please write me if you want to do the work and what you charge per day. If I like your price, I could book you for a longer cooperation.

    $3 / hr (Avg Bid)
    $3 / hr Giá đặt trung bình
    9 lượt đặt giá

    ...working conditions and well-being [PhD Project] Firms in developed countries are increasingly outsourcing services to the Global South through digital outsourcing labor platforms. For independent workers in the Global South, joining these platforms provides both opportunities and risks. This project connects platforms’ governance models, client firms’ behaviors and workers’ adaptive reactions to assess the working conditions and wellbeing of workers in the Global South. This project is part of the Adaptive Societies, Organizations and Workers theme. Over the last years, a growing number of firms from developed countries has outsourced services (e.g., software development, data verification, data processing, etc) to the Global South t...

    $104 (Avg Bid)
    $104 Giá đặt trung bình
    12 lượt đặt giá

    We are an Outsourcing Agency for Image Editing and we`re kindly looking for website designer to make a professional German and English website. Our existing website is based on Wordpress and needs to be modernized with a fresh, clean reduced and new design. Pls ask for further description, if needed.

    $603 (Avg Bid)
    $603 Giá đặt trung bình
    122 lượt đặt giá
    Need a dialer App Đã kết thúc left

    Normal SIM Based Call will be placed. Not SIP Calling / Internet Calling. Not calles like whatsapp / facebook / truecaller. Before Calling User can decide by which SIM call will be placed. During call user can not see that to which number the call is going. Not from notification bar or by any means. That means user will be totally blind about - to which number the call is placed or call is going on. While call is going on then it will be recorded by the App if phone supports. After call is completed, the dialed number will not be visible in phone's call history. But it will be displayed in Our App's history along with recorded voice file. But strictly, when call is going on then user must not see to which number call is ultimatly placed. It will be better If You can ...

    $192 (Avg Bid)
    $192 Giá đặt trung bình
    5 lượt đặt giá