Hi, A service provider supports the following SIP service: A user could apply a primary number and serveral virtual numbers, for example, primary number is 213xxxxxx in Los Angeles, vitual numbers are 312xxxxxx in Orlando, 616xxxxxx in Michigan etc. He only register the SIP account of 213xxxxxx on his SIP device, then Orlando's people just dial 312xxxxxx to call him, and similar process happens on 616xxxxxx.
Several months ago, I borrowed one SIP account from the provider to test the SIP service. In the incoming INVITE message from its proxy server, FROM header includes caller number, TO header consists of my primary number and REQUEST_URI is the same with TO header. I couldn't see any informations about virtual numbers in INVITE message. Now, I hear from the carrier has improved the SIP service, it is interesting that when calls from different virtual numbers are received, the ring tone(not ringback) of SIP device are diffenent. I don't know, but want to how the carrier realize it. If the carrier realizes it by Multi-Line way as RFC4504 refers to, it isn't complex. But is it possible that the incoming INVITE message has nothing about virturl numbers but some parameters of ring tones? so my question is whether some parameters in SIP or SDP protocols could configure ring tone during SIP calls. Thanks and regards, luke 2006-12-04 _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
