Polycom 3725-76302-001LI manual Polycom, Inc 249

Dial Rules Call Server Configuration

For example, to be able to call an enterprise partner by dialing the prefix 7 followed by an alias in the partner’s namespace, configure a Resolve to external address action with a preliminary script that transforms the string 7xxxx to H323:xxxx@enterprisepartner.com.

•If your enterprise includes another gatekeeper and you want to route calls to that gatekeeper without a prefix, add a dial rule using the Resolve to external gatekeeper action.

•If your enterprise includes a SIP peer and you want to route calls to that peer without a prefix, add a dial rule using the Resolve to external SIP peer action.

If you have multiple SIP peers, a call matching the rule is routed to the first one to answer. You may want to specify the domain(s) for which each is responsible (see “Add External SIP Peer Dialog Box” on page 109).

When routing to a SIP peer, the Polycom DMA system gives up its ability to route the call to other locations if the peer rejects the call. Consequently, a dial rule using the Resolve to external SIP peer action should generally be the last rule in the dial plan.

Note

In a mixed H.323 and SIP environment, the Polycom DMA system acts as a seamless gateway. If an H.323 device sends it a Location Request (LRQ) and the dial plan contains a dial rule using the Resolve to external SIP peer action, the DMA system will respond with a Location Confirm (LCF) because it can resolve the address by routing the H.323 call through its gateway to the SIP peer(s).

You can prevent H.323 calls from being routed to SIP peers by restricting which calls are routed to them in one or more of the following ways:

•Assign each SIP peer an authorized domain or domains (this is a good idea in any case in order to avoid dialing loops). See “Edit External SIP Peer Dialog Box” on page 114.

•Assign each SIP peer a prefix or prefix range. See “Edit External SIP Peer Dialog Box” on page 114.

•Add a preliminary script to the dial rule using the Resolve to external SIP peer action that ensures that the rule will only match a SIP address. See “Preliminary/ Postliminary Scripting” on page 254.

•Make the dial rule using the Resolve to external SIP peer action the last rule and ensure that all H.323 calls will match against one of the preceding dial rules.

See also:

“Dial Rules” on page 243

“Add Dial Rule Dialog Box” on page 250 “Edit Dial Rule Dialog Box” on page 252 “Preliminary/Postliminary Scripting” on page 254

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