Intra-office calls on the AR used as the IP PBX are normal, but inter-office calls fail to be connected

1. Check whether the country code and area code at both ends are consistent.
2. Check whether users, prefixes, enterprises that trunks belong to, and DN sets at both ends are consistent.
3. Check whether the call prefix is correctly configured, whether call rights are correct, and whether the call attribute of the call prefix is inter-office.
4. Check whether the inter-office trunk configuration is correct and whether the trunk status is normal.
5. Check whether the call prefix is correctly configured and whether the inter-office prefix is bound to the trunk group.

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