VoIP Gateway provides intelligent interconnection of the enterprise PBX, IP network, and the Public Switched Telephone Network (PSTN). Voice over IP (also known as, “Voice over Packet,” “Voice over Internet Protocol” or “VoIP”) is comprised of several interconnected processes that convert a voice signal into a stream of packets on a packet network and back again. VoIP Gateway allows the human voice to travel simultaneously over a single packet network line with both fax information and modem data.
VoIP Gateway provides rich benefits for all levels of suppliers and end users, from networking equipment manufacturers who are providing next-generation equipment to service providers, who can now market new services to end users in businesses and homes.
At the very minimum, these benefits include more cost-effective traditional voice and fax service. However, users will also benefit from revolutionary, new VoIP-based services. VoIP Gateway will fundamentally change the way communication occurs. New applications such as web-enabled call centers, collaborative white boarding, remote teleworking, and personal productivity applications such as “follow-me” services and unified message handling, are all part of the VoIP sea change. These innovative applications will maximize the power of converged voice, fax and data communications.
In VoIP systems—ranging from customer premises equipment all the way up to high density, carrier class systems— VoIP Gateway handle the critical function of digitizing the speaker’s voice. TI has developed the industry’s most comprehensive VoIP Gateway solutions product suite. Only TI provides a roadmap from two channel devices to OC-3 (2,016 channels) on a single chip with full solution density. Solution density refers to optimizing area per channel, power consumption, architecture and cost to support the features required by OEMs producing true toll quality gateways.
VoIP Gateway Trunk and Carrier Based Routing Enhancements: This feature module describes the VoIP Gateway Trunk and Carrier Based Routing Enhancements feature functionality in Cisco IOS Release 12.2(11) T, and includes the following sections:
Supported Standards, MIBs, and RFCs
Configuring Call Capacity Reporting for Unsolicited Calls
Troubleshooting VoIP Gateway Trunk and Carrier Based Routing
Voice wholesalers use multiple ingress and egress carriers to route traffic. A call coming in to a gateway on a particular ingress carrier must be routed to an appropriate egress carrier. As networks grow and become more complicated, the dial plans needed to route the carrier traffic efficiently become more complex and the need for carrier sensitive routing (CSR) increases.
The Gateway Trunk and Carrier Based Routing Enhancements feature implements CSR for Cisco voice gateways. The gateway feature described in their document adds the following routing features:
Implementation of trunk groups and enhanced key matches on several platforms and interfaces
Reduction of the number of dial peers in a dial plan by using profile aggregation and multiple trunk group supports
Enhanced hunting schemes
Call capacity updates on carriers and trunk groups
Carrier ID support
Trunk group label support
Number translation profiles per trunk group, source IP group, voice port, and dial peer
Dial peer support of multiple trunk groups with translations per trunk group
E.164 telephone number mapping (ENUM) support
Source IP groups
Voice over IP (VoIP) access list control
Enhanced translation rules in SED (stream editor) regular expressions
Incoming call blocking
Cisco IVR 2.0 support for carrier ID based dial peer matching, incoming call blocking, and dial peer number translation
Call detail record (CDR) support
Virtual private network (VPN) source routing (also referred to as static or basic carrier routing)
The following call handling sequence gives some orientation to these new capabilities.
In a typical scenario, a call from the PSTN arrives at a gateway (the ingress gateway), leaves the gateway as a VoIP call, arrives at a destination gateway (the egress gateway), and leaves that gateway as a PSTN call. For this example, trunk groups and translation rules have been defined using commands. Steps affected by the trunk groups and translation rules implemented in this feature are marked as “new”.