Лог шлюза во время исходящего вызова:
[2021-09-30 11:34:11] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:5b7df1181b0905263273a0842950a30f@100.100.100.20, sip_pvt_ptr:1146134016
[2021-09-30 11:34:15] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:739f87810afb87485a6836c6070e6798@100.100.100.20, sip_pvt_ptr:1146134016
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:9411912e-c524-484b-adf9-a26e686af885, sip_pvt_ptr:0
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt 1125927949,1146134724
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt username:201, 1, 100.100.100.177:5060
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: [YEASTARMAPDNS] Get peer by ip and toexten:89108446764
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt 1146110388,1146134724
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt username:89108446764, 1, 100.100.100.177:5060
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: zzzzccttt
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:9411912e-c524-484b-adf9-a26e686af885, sip_pvt_ptr:1146134016
[2021-09-30 11:34:16] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:9411912e-c524-484b-adf9-a26e686af885, sip_pvt_ptr:1146134016
[2021-09-30 11:34:16] NOTICE[1151] rtp.c: Set RTP to address rtp:1146136768 100.100.100.177:10790
[2021-09-30 11:34:16] NOTICE[26236] chan_dahdi.c: Channel 08 Set zone "ru"
[2021-09-30 11:34:20] WARNING[26236] chan_dahdi.c: Enabled echo cancellation on channel 8
[2021-09-30 11:34:22] WARNING[26236] chan_dahdi.c: Disabled echo cancellation on channel 8
[2021-09-30 11:34:22] NOTICE[26236] rtp.c: Stop RTP address rtp:1146136768 100.100.100.177:10790
[2021-09-30 11:34:22] NOTICE[1151] chan_sip.c: tttttttttccccccczzzzzzzzz callid:9411912e-c524-484b-adf9-a26e686af885, sip_pvt_ptr:1146134016
В поддержке ipmatika предложили задать одинаковое имя аккаунту на шлюзе и сотруднику. Не помогло.