A simple question about SIP header and SDP content. When a caller sends an INVITE message, there are many places containing IP address info. For example, 1) SIP header "via: SIP/2.0/TCP ***.***.***.***" 2) SIP header "Contact: <sip:.....;maddr=***.***.***.***"> 3) SDP content "o=- 0 0 IN IP4 ***.***.***.***: 4) SDP content "c=IN IP4 ***.***.***.***" My questions are: 1) Can they be different? If yes, give me an example? 2) What is the difference between SDP content "o=" and "c=", the two ip addresses are supposed to be the same or not? Is there any example that they are different? Thanks a lot. Howard.
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