Avaya IP Office SE Rls. 10.1, SIP Trunks with SBC. On long calls (30 mins plus) the user experiences one-way audio at some point after 30 minutes or so. User has to hang up and re-establish the call. Any time I've experienced one-way audio it has been related to RTP ports but usually the one-way audio is immediate. In this case the call is fine and then after some time the user experiences one-way audio on the established call. Any ideas?
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