Symptom
For example, if your callback target caller ID is 11111222223.
1 - If the SIP trunk used for Callback is Register-Type.
The From and To header would be the same number "11111222223".
2 - If the SIP trunk used for Callback is Peer-Type.
PBX would use "callback+target caller ID" in From URI of the INVITE packet to make callback calls.
See the following figure of the INVITE packet sample includes of the issue:
And when you check the CDR, you would find the Call From of the call log would be like "Callback11111222223".
Solution
- If you are using the Register-Type SIP trunk, make sure the From user field has been filled with the correct value. Usually, it is the same as the Username field.
- If you are using the Peer-Type SIP trunk, make sure the Global DOD has been configured, and upgrade the firmware version.
