Outgoing calls can be made, but incoming calls fail to be connected on the AR using a SIP IP trunk. Why

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Check whether the incoming prefix is correctly configured.
1. Check whether the remote IP address and port number of the SIP IP trunk are correct.
2. Check whether the configuration is valid. Run the display voice trunk-group trunk-group-name command to check trunk group information.
3. Verify that the local incoming prefix and incoming number change rules are correct.
4. Verify that the peer outgoing prefix and route number change rules are correct.

Other related questions:
When the U1960 is configured with one AT0 trunk, can multiple outgoing calls be made in a conference?
No, because only one AT0 trunk line is available. When the U1960 is configured with multiple AT0 trunks or the E1 digital trunk, multiple outgoing calls can be made in the conference to invite multiple participants.

When the U1981 routes outgoing calls through a trunk, can the call duration be restricted on the trunk?
When U1900 or SoftCo users make outgoing calls through a trunk, the call duration cannot be restricted on the trunk. You can run the following commands to modify the service rights for users one by one or in batches to restrict the duration of a single call with external users. 1. To add the outgoing call duration restriction service right, run the following command: config modify subscriber dn [subpbxno <0-251>] [callertimelimit <0-300>] [calledtimelimit <0-300>] [number <>] Parameters of the outgoing call duration restriction service: dn: User number subpbxno: PBX number. The default value is 0. callertimelimit: Call duration when the user is the calling party, in minutes. calledtimelimit: Call duration when the user is the called party, in minutes. number: Quantity of user numbers to have the service modified in batches. Note: To view the restriction on the call duration, run the show subscriber command. If only the call duration restriction for the calling party is configured, the outgoing call duration is restricted only when the user is the calling user. If only the call duration restriction for the called party is configured, the call duration is restricted only when the user is the called user. If the call duration restrictions for both the calling and called parties are configured, the call duration is restricted regardless of whether the user is the calling or called user.

When the IP phone under the U1911 initiates an outgoing conference call through the AT0 trunk, which AT0 trunk is used to route the call?
In the scenario where the U1900 uses the AT0 trunk for networking, for a local conference initiated on the IP phone, the corresponding dedicated line is used; for an instant conference, the line is selected in polling mode. If all AT0 lines are dedicated lines, only the outgoing call for initiating a local conference can be routed through these lines.

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.

How to configure the U1900 so that incoming calls made through the AT0 trunk can be transferred to a fixed extension number?
Log in to the web UI of the U1900 and choose Trunk > Trunk Configuration > AT0. Set the default called number 1 of the AT0 trunk to the corresponding extension number.

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