Core Issue
The debug isdn q931 command output shows that all calls are being sent with an unknown plan type:
Channel ID i = 0x8A
Calling Party Number i = 0x81, '225555111'
Plan:ISDN, Type:Unknown
Called Party Number i = 0x81, '555390'
Plan:ISDN, Type:Unknown
Sometimes it is necessary to set the ISDN calling number plan type to national or international to have calls pass successfully through a carrier.
Resolution
Consider translation rule four set on the gateway, as shown:
translation rule 4
rule 1 ^4 9004 international international
rule 2 ^4 904 national national
voice-port 0:D
translate calling 4
Perform these steps:
- Match any calling number beginning with the number 4 that has national or international carried across the VoIP network.
- Set the ISDN plan type for these numbers to national or international, respectively.
Additionally, prepend national numbers with 90 and international calling numbers with 900. In this case, the call is being placed through a PBX. An access code of 9 is used. National numbers are prepended with a 0, while international numbers are prepended with 00.
For more information, refer to:
Common Q931 Information Elements
0x8 - National standard
0x2 - National number
Call Presentation
Called party number (DNIS)
Calling party number (ANI)
Voice Gateways
IOS gateways
