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Peering-Proxy mode

Provides call routing for inbound calls to the WAN interface with configured prefixes when the Default Address is not set. The system relies on prefix routing to forward the call to the LAN side destination. With no prefixes configured, the system only forwards LAN to WAN calls with ANNEX O destinations.

This mode is typically deployed in networks with multiple internal NAT boundaries to provide prefix routing between gatekeeper zones.

Click the configure prefixes link or click Neighboring in the navigation panel at the top of the H.323 Settings page and refer to Configure H.323 Neighboring.

When you have finished configuring prefixes on the H.323 Neighboring page, return to the H.323 Settings page by clicking H.323 Settings in the navigation panel at the top of the H.323 Neighboring page.

Send parsed ANNEX O string Outbound

Select the Send parsed ANNEX O string Outbound checkbox to remove the host portion of the destination address.

For example, when the incoming destination address from the LAN is formatted as a H.323 URL 1234@example.com, the outgoing destination address will be parsed and sent as dialedDigits 1234 to the resolved example.com host address.

Send Unmodified Dial String to Gatekeeper

Select the Send Unmodified Dial String to Gatekeeper checkbox to forward all destination address information to the LAN gatekeeper unmodified.

For example, when the incoming destination address to the WAN is 9876@example.com, the system forwards this destination address to the LAN gatekeeper unmodified as 9876@example.com. When this option is not used, the host portion is stripped off and is forwarded to the LAN gatekeeper as destination address 9876.

Note: If the host part of the Annex O address resolves to the LAN gatekeeper device, routing loops can occur. When this option is selected, ensure the gatekeeper receiving the full ANNEX O string is properly configured and capable of receiving the full destination unresolved ANNEX O address. Some older gatekeepers cannot receive this unresolved string and the call will fail.

(Optional) Select the Allow public IP in LCF checkbox to allow public IP addresses to be returned in an LCF. This option should usually not be enabled.

When this option is set, the system does not ALG the address in the Location Confirm (LCF) to the system WAN IP. This allows the public IP WAN gatekeeper to send call setup directly to the public IP of the LAN gatekeeper.

By allowing public IP addresses to be returned in an LCF, the gatekeeper may be able to do more complex policy decisions.

This field should usually not be enabled; only use when the system has public IPs on both the WAN and LAN interfaces.

Decreases the TTL in the LCF to prevent LCF looping when Allow public IP in LCF is enabled.

Sets the port returned in Admission Confirm (ACF) messages. If no Custom Q.931 port is set, the default port of 1720 is used.

Remote NAT devices can intercept H.323 messages and modify these messages which results in call failure. Changing the TCP call setup port to something other than TCP 1720 can help with call completion in these cases. For example, modifying this field to port 5000 modifies the RCF message to instruct the registered WAN side clients to use this port for call signaling. TCP 1720 will still be a system listening port for B2B calls.

Note: Ensure the alternate port is not being used for other services.

Enables TCP keep-alive messages and sets the interval between messages in seconds. If this value is zero, no keep-alive messages are sent.

If no response is received, the TCP stack assumes the connected endpoint is no longer listening, and ends the connection. This field sends TCP keepalives to clients connected to the systems well known TCP 1720 port.

Default is 0 (disabled); the minimum setting is 120 seconds.

Enter a default alias to be added to incoming calls without a destination message in the Q.931 Setup message:

• E.164

• H.323

This alias allows the embedded gatekeeper or a LAN/Subscriber-side gatekeeper to route the call to a default endpoint.

For example, when a B2B call is placed to the system and the user only dialed the IP or FQDN of the WAN interface, the system adds this alias to the H.323 call setup message and forwards it to the LAN gatekeeper for call processing. This alias can be any alias actively registered to the LAN gatekeeper.

You may add a H.323 static client in the H.323 Clients List and configure this client as the default alias. The static H.323 client should be locked to prevent the client entry from being deleted.

A typical configuration scenario is to configure this field with an MCU IVR alias or a default MCU meeting room alias.

Default is E.164, no alias is set.