PSTN Gateway
In this type of deployment, the Ingress Voice Gateway is used as the PSTN Voice Gateway. The Ingress Voice Gateway is responsible for converting TDM speech to IP and for recognizing DTMF digits and converting them to RFC2833 events.
Note |
Unified CVP does not support passing SIP-Notify DTMF events. |
In a centralized Unified CVP deployment, you can separate the VoiceXML functionality from the Ingress Voice Gateway to provide a separate PSTN ingress layer. The separate PSTN layer and VoiceXML enable the deployment to support many VoiceXML sessions and PSTN interfaces. For example, the Cisco AS5400XM can accept a DS3 connection, and support up to 648 DSOs. However, a gateway that is handling that many ingress calls cannot also support as many VoiceXML sessions. In such cases, the VoiceXML sessions are off-loaded to a separate farm of only VoiceXML Gateways, such as Cisco VVB.
Note |
You can use any TDM interface, supported by Cisco IOS gateway and Cisco IOS version, and compatible with Unified CVP. |