![]() Because call setups always include DNIS information, it is recommended to use the incoming called-number command for inbound dial peer matching. The router or gateway matches these items in this order:Ĭalled number (DNIS) with the incoming called-number commandįirst, the router or gateway attempts to match the called number of the call setup request with the configured incoming called-number of each dial peer. ![]() ![]() The router or gateway matches the information elements in the setup message with the dial peer attributes to select an inbound dial peer. This can be significant as the Cisco IOS voice stack looks through dial peers from the top down, similar to an Access Control List. If the dial peers are used for call routing, a larger number of dial peers can add to the delay to route a call. Make sure that you have at least 20% of the total memory reserved for other CPU processes. Each dial peer consumes approximately 6KB of memory. Note: The maximum number of dial peers that can be configured on a Cisco IOS gateway depends on the available memory (DRAM). This is not a digit-by-digit match, rather the full digit string received in the setup request is used to match against configured dial peers. When the Cisco IOS router or gateway receives a call setup request, a dial peer match is made for the incoming call in order to facilitate routing the call to different session applications. This represents the POTS physical voice port. The ANI is also referred to as Calling Line Identification (CLID). This is a number string that represents the origin and is derived from the ISDN setup message or CAS ANI. This is the call destination dial string and is derived from the ISDN setup message or channel associated signaling (CAS) DNIS. The three call setup elements are: Call Setup Element Note: For outbound dial peers, this command is matched against the called number or DNIS strings. This dial peer command defines the POTS voice port through which calls to this dial peer are placed. When inbound call legs are matched, this command uses the calling number (initial or ANI string) to match the incoming call leg to an inbound dial peer.Ĭalling Number (ANI) for inboundor the Called number (DNIS) strings for outbound Gwy(config-dial-peer)# destination-pattern string When properly configured, this dial peer command uses the calling number to match the incoming call leg to an inbound dial peer. This dial peer command defines the initial calling number or automatic number identification (ANI) string. ![]() Gwy(config-dial-peer)# answer-address ANI_string When properly configured, this dial peer command uses the called number to match the incoming call leg to an inbound dial peer. This dial peer command defines the called number destination or dialed number identification service (DNIS) string. Gwy(config-dial-peer)# incoming called-number DNIS_string The four configurable Cisco IOS dial peer attributes and related call setup elements are shown here: Dial Peer Attribute Examples of Voice-Network calls legs are Voice over IP (VoIP), Voice over Frame Relay (VoFR), Voice over ATM (VoATM), and Multimedia Mail over IP (MMoIP). Inbound Voice-Network dial peers are associated to incoming Voice-Network call legs of the terminating router or gateway. Inbound POTS dial peers are associated to incoming POTS call legs on the initial router or gateway. Three information elements sent in the call setup message and four configurable dial peer command attributes are used to match dial peers as follows: Matching Inbound Dial Peers Inbound Dial Peers Elements and Attributes Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. Voice - Understanding Inbound and Outbound Dial Peers on Cisco IOS Platforms Voice - Understanding Dial Peers and Call Legs on Cisco IOS® Platforms Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: This document describes how the inbound and outbound dial peers are matched to traditional telephone services (POTS) and to Voice-Network call legs.
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