On Fri, 2007-10-26 at 11:12 -0700, John Riek wrote:> I need to know how fast a sip device needs to respond
> to an INVITE sip message from asterisk before asterisk
> retransmits the INVITE message again.
>
> Thanks
Snip ---
7.2.1 INVITE received
When an INVITE request is received by the gateway, a "100 Trying"
response MAY be sent back to the SIP network indicating that the
gateway is handling the call.
The necessary hardware resources for the media stream MUST be
reserved in the gateway when the INVITE is received, since an IAM
message cannot be sent before the resource reservation (especially
TCIC selection) takes place. Typically the resources consist of a
time slot in an E1/T1 and an RTP/UDP port on the IP side. Resources
might also include any quality-of-service provisions (although no
such practices are recommended in this document).
**********
After sending the IAM the timer T7 is started. The default value of
T7 is between 20 and 30 seconds. The gateway goes to the 'Trying'
state.
**********