With signaling gateways to non-SIP telephony interfaces, it generally corresponds temporally to alerting feedback received on the other side (i.e. PRI). Because one 180 Ringing message causes only one ringback tone, achieving multiple ringback tones requires successive retransmission.
But even without that consideration, many things in SIP are retransmitted periodically to account for the unreliability of the UDP transport. -- Alex On Wed, 19 Sep 2007, Adrian Marsh wrote: > Hi All, > > Can anyone tell me how the below can be happening? > > -- SIP/205-08439ee0 is ringing > -- SIP/405-084468f8 is ringing > -- SIP/405-084468f8 is ringing > -- SIP/405-084468f8 is ringing > -- SIP/405-084468f8 is ringing > > Where, according to A*k, its ringing the same SIP device at the same > time, 4 times.. ? > If a client logs on from several IPs, its last-come-last-known - right? > So there should only be one SIP/405 registered. > > Adrian > > _______________________________________________ > > Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ > > --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 > -- Alex Balashov Evariste Systems Web : http://www.evaristesys.com/ Tel : +1-678-954-0670 Direct : +1-678-954-0671 _______________________________________________ Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ --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
