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Call Server Configuration
Polycom, Inc. 244
● 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 105).
When routing to a SIP peer, the Polycom RealPresence 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.
See also:
Dial Rules on page 239
Edit Dial Rule Dialog Box on page 248
Preliminary/Postliminary Scripting on page 251
Add Dial Rule Dialog Box
The following table describes the fields in the Add Dial Rule dialog box.
Note: SIP<->H.323 Gateway Considerations
In a mixed H.323 and SIP environment, the Polycom RealPresence 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 RealPresence 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 110.
• Assign each SIP peer a prefix or prefix range. See Edit External SIP Peer Dialog Box on page 110.
• 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 251.
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.
Field Description
Dial Rule
Description The text description displayed on the Dial Rules page.
Action The action to be performed. When you select some actions, additional
settings become available.
See the table of dial rule actions below for more information about the actions
and the additional settings associated with them.
Enabled Clearing this check box lets you turn off a rule without deleting it.