We need the source code for a SIP client softphone for iphone, blackberry and Symbian with the following requirements:
1-Dialer supports SIP for signaling.
2-Dialer supports G729, GSM and [url removed, login to view] codec for sending audio data.
3-Dialer can run behind NAT or on private IP. Dialer supports NAT and firewall traversal using STUN. So client behind the firewall can make VoIP call using Dialer .
4-Dialer runs on application layer so it supports GPRS, WiFi and Bluetooth for internet connectivity.
5-Operating system: Dialer will run on the phone having Symbian or Windows Mobile 5 and 6.
6-Dialer works with SIP username/password
7-Dialer can send SMS over IP
8-Dialer now can pass through any Firewall: Dialer in combination with iMD Byte Saver can pass through any firewall....
9-Dialer Supports Loud Speaker
10-Dial directly from the phone’s address book