Sumin,
In general when you send an invite to a sip proxy,
It responds back with 100 Trying to acknowledge that
proxy received INVITE. This is to stop client from
resending INVITES. I don't think it takes time before
it sends 200 OK in case of negotiate media. Response
time is depending on how fast the message is processed
at proxy and callee and network transmission speed.
Most of the 100 Tryings you get are from proxy where
called part does not even know that there is an invite
intended to him.
-Sid
sumin seo <[EMAIL PROTECTED]> wrote: Hi All,
I have checked re-INVITE signaling flow in several RFCs, but I couldn't
find 100 Trying after re-INVITE.
But I have seen 100 Trying almost every times while i am doing interop with
other sip servers.
Could you let me know pros and cons of 100 Trying for re-INVITE and what the
recommendation is? to send 100 Trying for peace of mind?
Somebody said that UA can have time before it sends 200 OK when it has to
negotiate media.
If that is the case, why don't we use 100 Trying for Update?
Thanks in advance.
Regards,
Sumin.
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