I established connection between automatic telephone exchange of KX-NCP500UA and the gateway OpenVox VS-GW1600-8G.
In this part of the gateway 4 GSM cards can work. I created 4 SIP access points. I want to receive the following diagram of operation.
The entering call arrives on GSM-1 - the gateway directs it on SIP-1 port.
The outgoing call arrives on SIP-1 - the gateway directs it on GSM-1.
Similarly remaining 3 GSM cards.
But when I look a log of calls - I come to bewilderment. The gateway processes entering calls correctly. And in case of an outgoing call the gateway truly defines Caller ID. But for the unclear reason will organize connection with absolutely other GSM a card.
Please help me to set up the correct routes for outgoing calls.