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Re: Certain calls disconnect after 15 minutes
Sounds like depending on the destination phone number you are calling and what upstream carrier is negotiating the call there may or may not be a re-invite happening at the 15 minute mark on some of your calls. This is a series of packets that establishes a re-negotiation of the connection / call behind the scenes. This usually includes INVITE / 200 OK / ACK. There could be a few reasons why the call is dropping; however it is likely related to a failed dialog on the re-invite in which the re-invite ACK is not correctly happening. This could be the result of a SIP ALG, Firewall, broken user-agent-client (some older devices) incorrectly handle this. It also could be the result of a mangled callid, fromtag, totag, or on older devices (from uri, to uri, etc) .. etc. Just some things to think about and look into.
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