Case 1, we call from an external number to an internal one, receives a GSM gate. The quality of communication is excellent enter image description here

Case 2, we call from internal, to external, via GSM-gate but different. The audibility is good, there is no interference, but there are interruptions, as if the interlocutor (the caller) blows air bubbles from under the water, while he can hear the external one acceptablely. enter image description here

A call from inside to inside is accompanied by excellent audibility of the interlocutor.

The question of what guesses you may have about this, various theories and conjectures, I will take note of everything, because I just do not know where to begin to understand.

CentOS 6.5
Asterisk 11.2
gateways - Huawei e171, 2 incoming, 2 outgoing, operator Megafon. Located next to each other. If you insert SIM cards into mobile phones, there are no communication problems.

    1 answer 1

    Firmware same on GSM gateways?

    I suggest:

    1) проверить уровень сигнала на проблемном шлюзе; 2) попробовать разнести шлюзы подальше друг от друга, подключить в разные порты.
    • I'll try, and about the dressing, they can somehow jam each other? - BlackOverlord