© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring PSTN Interfaces and Voice Dial Peers Call Setup and Digit Manipulation

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Outline Overview What are Call Legs? End-to-End Calls Matching Inbound Dial Peers Matching Outbound Dial Peers Digit Collection and Consumption What is Digit Manipulation PLAR Summary

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Dial-Peer Call Legs

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v End-to-End Calls

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Matching Inbound Dial Peers Configurable parameters used for matching inbound dial peers: incoming called-number –Defines the called number or dialed number identification service (DNIS) string answer-address –Defines the originating calling number or automatic number identification (ANI) string destination-pattern –Uses the calling number (originating or ANI string) to match the incoming call leg to an inbound dial peer port –Attempts to match the configured dial-peer port to the voice port associated with the incoming call (POTS dial peers only)

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Matching Outbound Dial Peers

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Digit Consumption and Forwarding

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Digit Collection

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Digit Manipulation Commands prefix –Dial-peer command –Adds digits to the front of the dial string before it is forwarded to the telephony interface forward-digits –Dial-peer command –Controls the number of digits forwarded to the telephony interface number expansion table –Global command (num-exp) –Expands an extension into a full telephone number or replaces one number with another digit translation –Global and dial-peer command –Digit translation rules used to manipulate the calling number, or ANI, or the called number, or DNIS, digits for a voice call

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v PLAR Connection

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Summary A call is segmented into call legs with a dial peer associated with each call leg. A call leg is a logical connection between two gateways or routers or between a gateway or router and a telephony endpoint. An end-to-end call comprises four call legs: two from the voice router perspective and two from the destination router perspective. If no matching inbound dial peer is configured for a call, the default dial peer is used. Inbound dial-peer matching uses incoming called-number, answer-address, destination pattern, and portin that orderto match inbound dial peers.

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Summary (Cont.) Outbound dial-peer matching uses the longest number match in the destination pattern to match an outbound dial peer. On POTS dial peers, only wildcard-matched digits are forwarded by default. The prefix and forward-digits commands define how digits are sent out to the voice port. The num-exp and translation-rule commands define how one number is replaced with another number. The connection plar command permanently associates a voice port with a specific telephone number. The voice port does not present a dial tone, but automatically generates the configured number.