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snom 7xx series invite timeout


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Does anyone have any experience on how to make snom 7xx (720 and 760) series phones stop ringing when they receive an invite and then never receive a SIP CANCEL (for example if the phones lose registration).



We are tesitng some failover techniques and if the phones have already began to ring after they receive a SIP INVITE, we need to be able to define, hopefully per identity, how long they will ring without receiving a CANCEL.




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Interesting question. I believe according to the RFC, this is the "intended" behavior. I know aout customers who want to to ring for two hours, if neccessary. But it would be good to stop ringing if the TCP connection goes down. The alternative would be as you indicated a settings how long it should ring max. There is a setting ring_duration (see http://wiki.snom.com/Settings/ring_duration) that might do the trick, although it seems it redirects the call (maybe you can redirect the call into nirvana after five minutes).

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