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Hello and thank you for posting to our forum.
If you have some basic SIP configuration for your application, I can help you come up with a config that should work in the same manner as CAC.
What type of physical connection do you have from the ADTRAN to the SIP Server or next hop? T1, Ethernet?
Do you know if you will be using G.711 or G.729 for calls out the SIP trunk?
Based on the answers to the questions above, we can calculate the max-number of calls to be allowed on the SIP voice trunk. For example, if you are using G.711, we can approximate the bandwidth of each call be be about 90k. If you have a data T1 connection, then you have about 1544k bandwidth. 1544k / 90k = 17.16 calls. To be safe, you can set the max-number of calls to 15 (although 17 should be fine).
In addition, we can put an accept with a higher cost on a different voice trunk so the ADTRAN will use a different trunk (and a different physical interface on the ADTRAN) should the max-number of calls be reached on the SIP trunk. Below would be an example config:
voice trunk T01 type sip
description "T1 to SIP"
sip-server primary 10.1.1.250
voice trunk T02 type sip
description "Overflow SIP"
sip-server primary 192.168.1.250
voice grouped-trunk SIP
accept $ cost 0
voice grouped-trunk Overflow
accept $ cost 50
Let me know if you have any questions.
I went ahead and flagged this post as “Assumed Answered.” If any of the responses on this thread assisted you, please mark them as either Correct or Helpful answers with the applicable buttons. This will make them visible and help other members of the community find solutions more easily. If you still need assistance, I would be more than happy to continue working with you on this - just let me know in a reply.