Intercom "Call" how to set up?

Question

Asterisk

At one facility, unknown craftsmen organized two-way communication via ip-telephony through an intercom.
Soldered it, on rj9 and through cisco spa122 output to asterisk.
The study of the logs showed that the intercom is ringing to number 1002. When dialing the number, tone dialing is heard, after which there is a beep until the answer. but does not transmit voices.
1. How can I set the intercom to dial another number?
2. How to adjust the sound?

Answer 1

intercom model?
Does it not support SIP?
If yes, then configure the extension (internal number) on the VoIP gateway, in this case you have cisco spa122.

tone dialing is heard when dialing a number

Where is it heard, on the intercom?

but no voice

Does he call? Does Asterisk accept the challenge?