Transparent Common Channel Signaling

Transparent Common Channel Signaling - the outgoing...

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Transparent Common Channel Signaling (T−CCS) versus Native PRI The Cisco 2600/3600 series routers with the PRI can also support T−CCS. T−CCS allows the connection of two PBXs with digital interfaces that use a proprietary or unsupported CCS protocol without the need for interpretation of CCS signaling for call processing. T1/E1 traffic is transported transparently through the data network and the feature preserves proprietary signaling. From the PBX standpoint, the signaling is performed through a point−to−point connection. Calls from the PBXs are not routed, but follow a preconfigured route to the destination. This feature allows PBX feature transparency across a WAN and permits PBX networks to provide advanced features, such as calling name and number display, camp−on and callback, network call forwarding, centralized attendant, and centralized message waiting. Native PRI support means that the D−channel signaling is interpreted and terminated locally by the Cisco IOS gateway. The router can then make call−routing decisions based on the called number (DNIS) matched with
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Unformatted text preview: the outgoing dialpeer. The voice interface on the other side of the network may be PRI or another voice trunk protocol (for instance, QSIG, E&M, or FXS/FXO). This configuration supports fully switched calls between all locations. With TCCS, on the other hand, the signaling is transparently tunneled across the IP/Frame Relay/ATM cloud in a pointtopoint manner between two PBXs. The PBXs are configured as if they are connected directly to one another and must run the same voice trunk protocol. Voice calls cannot be switched, and are set up in a static manner through a connection trunk between locations with onetoone mapping. The signaling channel defined between the PBX and the router must use the clear codec setting. The voice traffic can be encoded by any codecs defined on the dial peers between the two routers. These diagrams and table show a sample configuration of TCCS....
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Transparent Common Channel Signaling - the outgoing...

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