In case of BBUA, is it possible for proxy to generate 1xx
response for anINVITE, before receiving any reply from
terminating SIP client. For Ex. SIP client A calling another
SIP client B, and before receivingany reply from the SIP client B
for the initial INVITE, can proxy generate 180 RINIGING reply?
In principle, no, a proxy cannot. But in practice, it can --
The metaphor is that the proxy forks the INVITE, and one forked INVITE
goes to a UA which is internal to the device. That UA provides a 180
response. One consequence is that this 180 response has a to-tag
which is different from the to-tags used by any of the "real"
responses to the INVITE.
Dale
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