[asterisk-users] SIP response time in Asterisk

[John Riek]

In what amount of time does "100 Trying message" have
to be sent to asterisk?  I see asterisk retransmitting
the INVITE message multiple times before receiving the
"100 Trying message".


--- David Boyd <dboyd at ignitetrx.com> wrote:

> 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.
> **********
> 
> 
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