We need a sip softphone for debian. You can take any well-working open-source implementation as a base. It will be required to check/rewrite the code to match security requirements. Requirements are like checking the result of operation after any conditional operation, checking the result of memory allocation/deallocation, erasing deallocated memory and so on. Mostly mechanical work. We will be able to provide detailed requirements in written (about 5 pages) to the appropriate bidders closer to the end of the bidding period. It must be modular and allow to add other transport protocols later in addition to sip.
Are there any professionals or team who are capable doing this job? If so please bid.
P.S. Only serious bidders please.