SIP User's Manual 348 Document #: LTRT-83310
Mediant 600 & Mediant 1000
18.7.3 Dial Plan Prefix Tags for IP-to-Tel Routing
The device supports the use of string labels (or "tags") in the external Dial Plan file for
tagging incoming IP-to-Tel calls. The special “tag” is added as a prefix to the called party
number, and then the Inbound IP Routing Table uses this “tag” instead of the original
prefix. Manipulation is then performed after routing in the Manipulation table, which strips
the “tag” characters before sending the call to the endpoint.
This feature resolves the limitation of entries in the Inbound IP Routing Table (IP-to-Tel call
routing) for scenarios in which many different routing rules are required. For example, a city
may have many different area codes, some for local calls and others for long distance calls
(e.g. 425-202-xxxx for local calls, but 425-200-xxxx for long distance calls).
For using tags, the Dial Plan file is defined as follows:
Number of dial plan (text)
Dial string prefix (ranges can be defined in brackets)
User-defined routing tag (text)
Note: Dial Plan Prefix Tags are not applicable to FXS and FXO interfaces.
The example configuration below assumes a scenario where multiple prefixes exist for
local and long distance calls:
To use Dial Plan file routing tags:
1. Load an ini file to the device that selects the Dial Plan index (e.g., 1) for routing tags,
as shown below:
IP2TelTaggingDestDialPlanIndex = 1
2. Define the external Dial Plan file with two routing tags (as shown below):
• "LOCL" - for local calls
• "LONG" - for long distance calls
]
42520[3-5],0,LOCL
425207,0,LOCL
42529,0,LOCL
425200,0,LONG
Therefore, if an incoming IP call to destination prefix 425203 (for example) is received,
the device adds the prefix tag "LOCL" (as specified in the Dial Plan file), resulting in
the number "LOCL425203".
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