McDewey

Quality of Service for Voice over IP Resource Reservation Protocol 26 QoSVoIP.mif The following configuration example shows how to configure local gateway resources if CAC fails by tuning the Q.931 Disconnect Cause: A second option is to allow the gateway to reroute the call through another path. If the dial peer matched by the call is part of a hunt group, other dial peers in that group are tried according to the preference dial-peer configuration command. This allows you to implement different types of call routing on the gateway that consider QoS across IP networks. The following configuration example shows how to configure local gateway resources by rerouting calls on the gateway if CAC fails: Configuration Example 11: Tuning the O.931 Disconnect Cause ! interface Serial1/0:23 no ip address no logging event link-status isdn switch-type primary-ni isdn network-failure-cause 42 isdn incoming-voice voice no cdp enable ! In this example, the router sends a Q.931 DISCONNECT message with a “Switching Equipment Congestion” (42) cause when an ISDN call fails CAC on the VoIP leg. Configuration Example 12: Call Rerouting on the Gateway dial-peer voice 100 pots destination-pattern 2...... no digit-strip direct-inward-dial port 1/0:23 ! dial-peer voice 300 voip preference 0 destination-pattern 3...... session target ipv4:10.77.39.129 req-qos guaranteed-delay acc-qos guaranteed-delay ! dial-peer voice 400 voip preference 2 destination-pattern 3...... session target ipv4:10.23.45.2 req-qos guaranteed-delay acc-qos guaranteed-delay ! dial-peer voice 500 pots preference 5 destination-pattern 3...... no digit-strip direct-inward-dial port 1/1:23 !