I am using Asterisks PBX with TalkSwitch (TS-350i) and Grandstream (GXP140X) IP phones without any issues.
We do have a special requirement to have distinctive ringing sound form special extensions. We successfully managed to do that with all Grandstream IP phones by altering the SIP header using SipAddHeader(Alert-Info:http://127.0.0.1/Bellcore-dr3) command.
Unfortunately, this did not work with TalkSwitch IP phones. I assume we should use deferent sound file name.
Any idea what file name or command should I use for TalkSwitch IP phones?