I've found an interesting link. It might help you out. http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/EA_ISD.html
Peter Joe Carroll wrote: > Hello... > We're attempting to track down an intermittent echo issue. Our setup is > <phone>sip<asterisk>sip<tnt>pri to carriers. We have less than 2 ms latency > on the networks (FTTx), totally SIP w/ G711u. The party hearing the echo is > the subscriber using sip. The PSTN users does not hear the echo. > > We should be note that there is zero echo when calling sip to sip with or > without reinvites enabled. > > We have several different phones; linksys, polycom, & grandstream (both atas > and phones). It's difficult to reproduce the problem regularly so isolation > is an issue. > > > Thanks in advance.. > -Joe > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
