On Mon, Mar 9, 2009 at 11:37 AM, Dale Worley <[email protected]> wrote: > On Mon, 2009-03-09 at 10:13 -0400, Scott Lawrence wrote: >> I've been seeing a lot of 3.11 traces lately in which Polycom phones >> send 'Require: 100rel' in 180 responses. > > I assume these are responses to requests that contain "Supported: > 100rel". >
In the case of sipxbridge, one can suppress PRACK generation from polycom by not adding Supported: 100rel header and by not adding Allow: PRACK However, this will not work in the case of other PSTN gateways that do want to send PRACK for legitimate reasons so this is not a good solution. >> Is there some reason why someone thought this was a good thing? >> >> It adds quite a lot of traffic to the system, and I am not aware of any >> reason why we need it. If this is currently the default setting in our >> Polycom (or any other vendor) configurations, then I think we should >> change it to _not_ request reliable provisional responses. > > There seems to be a general attitude in the SIP community that reliable > provisional responses are a Good Thing. Its reliable so it must be good. But on the other hand, if responses are a good thing in the first place, more must be better; so one might present a compelling case for the converse hypothesis. :-) Ranga > > Dale > > > _______________________________________________ > sipx-dev mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-dev > Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev > -- M. Ranganathan _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev
