When using ANPI VoIP service there are two required settings that can be found on the SIP Proxy -> Advanced -> Optional Settings page. These settings are:
- Enable Sending SIP to original destination
- Protocols To Use: UDP
The Enable Sending SIP to original destination option should be checked and the Protocols To Use option should be set to UDP.
Example
These settings are available in software versions 10.7.2 and newer.
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