We require a simple SIP client for Symbian OS. Following is a list of the basic and only things required:
1) SIP Server/Domain will be hardcoded. User only needs to enter Username/Password. This means the client will only register to one server.
2) SIP Client should support both transports UDP/TLS and both transports RTP/SRTP as very basic requirements.
3) Client should support all latest Symbian (Nokia) phones. Mostly and 3rd and 5th editions devices like Nokia 5800 Xpressmusic which will be used for testing your work.
Please only quote if you have experience in Symbian.