[SIPForum-discussion] What to do if sent-by value is missing in responses while proxy processing them ?

[Yevgen Krapiva]

Hi all.

This is quotation from RFC3261 about stateless response processing:

>  Response processing as described in Section 16.7 does not apply to a
>  proxy behaving statelessly.  When a response arrives at a stateless
>  proxy, the proxy MUST inspect the sent-by value in the first
>  (topmost) Via header field value.
>  ...
> If the address does not match the
> proxy, the message MUST be silently discarded.

What to do if sent-by value is not present in responses ? :)
For example, I didn't find any in rfc3665 (sip call flow examples).