Can someone clarify the difference in Via and Record Route. Whne should one
use Via versus when should Record Route be used. They perhaps have a subtle
difference which is not quite clear to me.
As per Section 1.4.5
If a proxy server forwards a SIP request, it MUST add itself to the
beginning of the list of forwarders noted in the Via (Section 6.47)headers.
The Via trace ensures that replies can take the same path back, ensuring
correct operation through compliant firewalls and avoiding request loops. On
the response path, each host MUST remove its Via, so that routing internal
information is hidden from the callee and outside networks.
As per Section 6.35
The Record-Route request and response header field is added to a request by
any proxy that insists on being in the path of subsequent requests for the
same call leg.
Thanks,
Satish
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