We are looking for a SIP client softphone for iphone, blackberry and Symbian with the following requirements.
The Dialer supports SIP for signaling.
The Dialer supports G729, GSM and [url removed, login to view] codec for sending audio data.
The 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 .
The Dialer runs on application layer so it supports GPRS, WiFi and Bluetooth for internet connectivity.
Operating system: Dialer will run on the iphone and phones having Symbian or Windows Mobile 5 and 6.
The Dialer works with SIP username/password
The Dialer can send SMS over IP
The Dialer now can pass through any Firewall: Dialer in combination with iMD Byte Saver can pass through any firewall.
The Dialer Supports Loud Speaker
The Dial directly from the phone’s address book