Регулярные обрывы входящих по SIP. Опции

[pstn]

Добрый день.

Есть станция iPECS LIK-1200 (5.5Gt), работает в качестве конвертора. Входящий вызов с потока E1 (PRIM) транзитои через VOIM 24 поступает на CALL центр (софт на сервере), подключенный по протоколу SIP, работает как точка-точка. Проблема в том что, с разной периодичностью отваливаются разговоры. Есть лог, снятый на сетевом оборудовании, в нём просматриваются моменты потери соединений:

07:03:40.468 (04332 ) ERR> Sip request message (size 922) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:30.796 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:31.296 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:32.312 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:34.328 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:38.328 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:17:46.343 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:18:35.531 (02264/main) ERR> Lost connections to all CDs/ETCs
07:24:35.531 (02264/main) ERR> Lost connections to all CDs/ETCs
07:41:00.609 (02264/main) ERR> Lost connections to all CDs/ETCs
07:56:00.984 (02264/main) ERR> Lost connections to all CDs/ETCs
07:56:20.984 (02264/main) ERR> Lost connections to all CDs/ETCs
07:58:27.484 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:58:27.984 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:58:29.000 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none
User-Agent: LG-Ericsson iPECS-LIK 1200 5.5Gt
Contact: <'
07:58:31.015 (04332 ) ERR> Sip request message (size 923) decoding - Error: expected '[^@]' in '@172.22.0.42>; party=redirect; privacy=off; screen=yes
Privacy: none