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
>
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--
Alex Balashov
Evariste Systems
Web : http://www.evaristesys.com/
Tel : +1-678-954-0670
Direct : +1-678-954-0671