Dial Rules Call Server Configuration
Polycom, Inc. 249
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.
See also:
“Dial Rules” on page 243
“Add Dial Rule Dialog Box” on page250
“Edit Dial Rule Dialog Box” on page252
“Preliminary/Postliminary Scripting” on page254
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 page114.
•Assign each SIP peer a prefix or prefix range. See “Edit External SIP Peer
Dialog Box” on page114.
•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.