How to set up outgoing calls (with a choice of SIM card - the source of the call) on the GSM gateway Openvox VS-GW1600-16G?

Question

Asterisk

There is the above-mentioned gateway, all four modules work in cluster mode, there are 16 SIM cards in total. There is a built-in Asterisk and two SIP accounts are registered and work directly with the gateway. It is necessary to implement by means of the gateway the ability to select a SIM card from which an outgoing call will be made, and in such a way that users can safely use it.

Answer 1

The idea is similar to this solution , it remains only to study the configs for the Dial call format.

Answer 2

if in the
output of asrerisk -rx "sip show peers"
the gateway is seen as one peer or as several, but they are all with the same port, then the choice of SIM card can only be done using the dial prefix