19 Jan
2011
19 Jan
'11
8:49 a.m.
Am 18.01.2011 20:27, schrieb Vikram Ragukumar:
Hello,
Alex, Klaus thank you for your replies.
Does the SIP server perform NAT traversal?
Does the SIP proxy perform NAT traversal?
How does the SIP server route the INVITE requests? Does it route based
on registered Contact or does it route them statically to the SIP proxy?
Depending on the routing behavior on the SIP server you can build a
workaround on the proxy.
regards
klaus
Usually the softphones register to the proxy or
SIP server. Thus, the
proxy or SIP server knows under which IP:port (The IP:port from which
the REGISTER was received) it can contact the sofpthone.
Yes, the softphones are registered to the SIP server, and hence the SIP
server has the IP:port information required to contact the softphone.
However, the SIP server does not include the port number in the R-URI of
the INVITE that it generates.
This port number is dynamically assigned by the firewall and is not
fixed, so manipulating the pseudo variable $rp by assigning it a fixed
number will not work.
If it is not mandatory to include the port number in the R-URI, how does
the proxy determine the port to which the SIP message must be forwarded ?
Thanks and Regards,
Vikram.