David Frascone wrote:
>
> Does anyone know the answer to this? Should I switch to the sip list?
>
>
> On Fri, Jan 19, 2001 at 11:16:13AM -0600, David Frascone wrote:
> > From section 10.2.1:
> >
> > Subsequent retransmissions are spaced by T2 seconds. If the client
> > receives a provisional response, it continues to retransmit the
> > request, but with an interval of T2 seconds. Retransmissions cease
> > when the client has sent a total of eleven packets, or receives a
> > definitive response. Default values for T1 and T2 are 500 ms and 4 s,
> > respectively. Clients MAY use larger values, but SHOULDNOT use
> > smaller ones. Servers retransmit the response upon receipt of a
> >
> > Which means, the INVITE would be retransmitted every 4 seconds
> > while the caller is waiting in the queue. And, would stop after
> > 11 retransmissions, or 44 seconds, which is still too small for
> > some queues.
You are correct -- the text you quoted does say this. However,
if you seek to the beginning of the same paragraph, you find:
A SIP client using an unreliable transport protocol such as UDP
SHOULD retransmit requests other than INVITE or ACK [...]
Look to section 10.3 for reliability-related behaviour for INVITEs.
- Jo.
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