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Add env variables table, verification steps, docker run alternative, and custom config override instructions. Note auto-restart on reboot. https://claude.ai/code/session_01M7DJEAxrReANcMZ6SjChaG
chan_dongle produces slin (signed linear) audio. With only g722 allowed on the IAX2 trunk and potentially no timing source, transcoding from dongle→trunk fails silently causing one-way audio (agent can't hear the GSM caller). - Add alaw and ulaw to IAX2 allowed codecs for reliable transcoding - Enable codec_ulaw, codec_a_mu (alaw↔ulaw) in Dockerfile menuselect - Enable res_timing_timerfd — required for any codec transcoding https://claude.ai/code/session_01M7DJEAxrReANcMZ6SjChaG
IAX2 encryption=yes caused one-way audio on inbound GSM calls (agent couldn't hear caller). When this Asterisk originates the IAX2 call for inbound GSM→trunk routing, the AES key exchange wasn't working properly with the remote PBX. Disabling encryption fixes bidirectional audio. https://claude.ai/code/session_01M7DJEAxrReANcMZ6SjChaG
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