We are looking into the possibility of replacing our PRIs with new ones. The new company has asked for the number of digits that we are accepting from the old company. Looking at our dial plans in CUCM 7.1 it looks like we are only accepting 4, but I am not certain. Is there an easy way to see the nember of digits that are being passed down from the phone company? I have a Cisco 2811 router accepting the PRIs and passing it on over, but I do not see anyting on there that tells me the number of digits.
Is there an easy way to see this?
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You can verify this in CUCM/Gateway
Call Routing Information - Inbound Calls
Choose the number of significant digits to collect, from 0 to 32 or All. Cisco Unified CallManager counts significant digits from the right (last digit) of the number that is called. If you choose All, the Cisco Unified CallManager does not truncate the inbound number.
Digits received are 123456.
Significant digits setting is 4.
Digits translated are 3456.
Use for the processing of incoming calls and to indicate the number of digits, starting from the last digit of the called number, that are used to route calls that are coming into the PRI span. See Prefix DN.
I have found the command "debug isdn q931" to be the most reliable way to verify the number of digits coming in a PRI regardless of using MGCP, SIP or H323. Once you have the debug enabled just place an inbound call and look for the called party number which will show you the incoming digits received.