Cisco Cisco Customer Voice Portal 8.0(1) Design Guide
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Cisco Unified Customer Voice Portal (CVP) 8.x Solution Reference Network Design (SRND)
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Chapter 4 Designing Unified CVP for High Availability
VoiceXML Gateway
Centralized VoiceXML Gateways
In this configuration, the VoiceXML gateways reside in the same data center as the Unified CVP Call
Server.
Server.
H.323 VoiceXML Gateways
On the gatekeeper, configure a zone prefix list that contains the H.323 IDs of all VoiceXML gateways at
the data center. For example, assume that there are three VoiceXML gateways in the data center with
H.323 IDs of VoiceXMLgw1, VoiceXMLgw2, and VoiceXMLgw3, and that the ICM label for the
Network VRU is 5551000. In this example, the gatekeeper distributes calls in essentially a round-robin
scheme among all three VoiceXML gateways, provided they are all in service:
the data center. For example, assume that there are three VoiceXML gateways in the data center with
H.323 IDs of VoiceXMLgw1, VoiceXMLgw2, and VoiceXMLgw3, and that the ICM label for the
Network VRU is 5551000. In this example, the gatekeeper distributes calls in essentially a round-robin
scheme among all three VoiceXML gateways, provided they are all in service:
zone prefix gkzone-name 5551000* gw-priority 10 VoiceXMLgw1 VoiceXMLgw2 VoiceXMLgw3
SIP VoiceXML Gateways
If you are using Cisco Unified Presence Server: On the SIP proxy server, configure a static route for the
Network VRU label for each gateway. If the VRU label is 5551000, the static route pattern would be
5551000* in order to allow for the correlation-id to be appended and routed to the VoiceXML gateway.
Network VRU label for each gateway. If the VRU label is 5551000, the static route pattern would be
5551000* in order to allow for the correlation-id to be appended and routed to the VoiceXML gateway.
If you are using SIP static routes on the Unified CVP Call Server: Under the SIP Service configuration
for the Call Server, configure a static route for each Network VRU label and gateway. If the VRU label
is 5551000, the static route pattern would be 5551000>. The > is a wildcard representing one or more
digits, and it is needed so that the correlation-id appended to the DNIS number can be passed to the
VoiceXML gateway correctly.
for the Call Server, configure a static route for each Network VRU label and gateway. If the VRU label
is 5551000, the static route pattern would be 5551000>. The > is a wildcard representing one or more
digits, and it is needed so that the correlation-id appended to the DNIS number can be passed to the
VoiceXML gateway correctly.
Note
Other wildcard characters can be used. Refer to the topic Valid Formats for Dialed Numbers in the
Operations Console online help for complete wildcard format and precedence information.
Operations Console online help for complete wildcard format and precedence information.
In the case of both SIP proxy or Unified CVP static routes, the next-hop address of the route can be either
the IP address of the gateway or a DNS SRV record. If you are using an IP address, you must create
multiple static routes, one for each VoiceXML gateway. In the case of DNS SRV, only one route per
Network VRU label is needed, and the SRV record will provide for load-balancing and redundancy.
the IP address of the gateway or a DNS SRV record. If you are using an IP address, you must create
multiple static routes, one for each VoiceXML gateway. In the case of DNS SRV, only one route per
Network VRU label is needed, and the SRV record will provide for load-balancing and redundancy.
Distributed VoiceXML Gateways (Co-Resident Ingress Gateway and VoiceXML)
In this configuration, the gateway that processes the incoming call from the PSTN is separated from the
Unified CVP servers by a low-bandwidth connection such as a WAN, and the VoiceXML gateway that
is used is the same as the ingress gateway. The purpose of this configuration is to keep the media stream
at the edge to avoid consuming bandwidth on the WAN.
Unified CVP servers by a low-bandwidth connection such as a WAN, and the VoiceXML gateway that
is used is the same as the ingress gateway. The purpose of this configuration is to keep the media stream
at the edge to avoid consuming bandwidth on the WAN.
H.323 VoiceXML Gateways
Use the SetTransferLabel in VBAdmin (not gatekeeper zone prefixes) to control the selection of the
VoiceXML gateway. The SetTransferLabel command is specified per Network VRU label. When the
Unified CVP Call Server receives a label from ICM that matches what is configured in the
SetTransferLabel, the Call Server performs a gatekeeper lookup but ignores the destination gateway
returned by the gatekeeper and sends the call back to the gateway that originated the call. The H.323
Service determines the originating gateway by looking at the source IP address of the H.323 signaling.
VoiceXML gateway. The SetTransferLabel command is specified per Network VRU label. When the
Unified CVP Call Server receives a label from ICM that matches what is configured in the
SetTransferLabel, the Call Server performs a gatekeeper lookup but ignores the destination gateway
returned by the gatekeeper and sends the call back to the gateway that originated the call. The H.323
Service determines the originating gateway by looking at the source IP address of the H.323 signaling.