Markus,
Can you detail a little more the purpose of using the maddr parameter in the SIP addressing ?. Section 18.1.1 of RFC3261 touches on the use of maddr in the VIA header of a request. An example purpose of this would be to send a REGISTER request to the 'all SIP servers' multicast address 224.0.1.75 - which is also why the RFC recommends including a TTL of 1 so that the request doesn't propagate outside the local network.
Conferencing or placing someone on Music on Hold to a a multicast stream is typically seen with directed IPv4 unicast addressing or DNS entries in the SIP address header fields and a maddr address in the SDP.
Regards,
Wayne Davies
Hello everybody,
I have questions about the maddr parameter. I have to write a program which should have an maddr in the Request-URI. I read the RFC 3261 but it seems that I don't have an understanding for this.
What is the maddr parameter? Multi-home address or Multicast address? When is a proxy responsible for a request with a maddr parameter and when not? How looks a RequestURI with a maddr parameter?
Thank you very much.
Greeting
Markus
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