SIP Significant Digits - SigDigits

Configuration of Unified CVP SIP Service:
The Unified CVP SIP Service does not currently have a configuration field for setting the significant digits that should be stripped. Instead, you must edit the sip.properties file. The sip.properties file is located in the C:\Cisco\CVP\conf directory by default. Add the following line to the end of the sip.properties file (to strip four digits from the DNIS number):
SIP.SigDigits = 4

Configuration of VoiceXML gateway:
Configure the VXML gateway to match the DNIS string, including the prepended digits:
dial-peer voice 3000 voip
incoming-called number 33335551000T
service bootstrap
...
Configure the Unified CVP bootstrap.tcl application with the sigdigits parameter, telling it how many digits to strip off of the incoming DNIS string:
application
service bootstrap flash:bootstrap.tcl
param sigdigits 4
...

Cisco Unified CM configuration (if used):
Configure Unified CM to strip the prepended digits, either by using the Significant Digits configuration on the SIP Trunk configuration page or by using translation patterns.

SIP Proxy configuration:
Define static routes on the SIP Proxy, with the prepended digit present, to be sent to the appropriate VoiceXML gateway. Because transfers to agents on a Unified CM cluster will also have the digits prepended, the static routes for agent phones must also contain the prepended digits.