On Mon, 2009-03-09 at 11:37 -0400, Dale Worley 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".
> > 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. The reasons for using them have to do with doing ISDN signaling translation - a gateway will send 'Require: 100rel' to elicit the PRACK so that it can do a better job on the ISDN side. On the phone side, they don't really do anything but clutter up the proxy with extra messages. _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev
