We have a site experience outbound ISDN call failed on international number.
Call flow as below:
IP phone --SIP-- CUCM -- SIP -- VG -- T1 -- ITSP
When user make outbound call, it gets busy tone. As site is located in USA and we could not get anyone in USA to test call, so I made call from Australia to USA DN +1917 338 8645 where is setup CFA to international number +49 30 5150 3802.
Calling number - 61280621560
called number - 00011 1917 338 8645
final destination number - 9011 49 30 5150 3802
When I call that number +49 30 5150 3802 directly from Australia, it's a valid number.
I have IOS debug for ccsip and isdn q931, i cannot see call is setup. Any idea?
The Call set to the PSTN has a plan type of National..Should this not be an international call?
Apr 29 08:23:54.505: ISDN Se0/0/0:23 Q931: TX -> SETUP pd = 8 callref = 0x2364 Bearer Capability i = 0x8090A2 Standard = CCITT Transfer Capability = Speech Transfer Mode = Circuit Transfer Rate = 64 kbit/s Channel ID i = 0xA98397 Exclusive, Channel 23 Calling Party Number i = 0x2181, '2125751055' Plan:ISDN, Type:National Called Party Number i = 0x80, '011493051503802' Plan:Unknown, Type:Unknown Apr 29 08:23:54.505: //826041/85D449800000/SIP/Msg/ccsipDisplayMsg:
AFter the call setup was sent to your telco, they disconnected the call
original issue was noticed when call Berlin number directly from US. We have setup test call flow (Syd number call US number where CFA to Berlin) to simulate issue as US office is not open yet and we are based in Australia.
Thank both Avodeji and you suggestion and see how it goes.
You are correct, the called number has the plan and isdn type set to unknown. I will advise you to call your provider and find out why they are disconnecting the call. Its their switch that is terminating the call
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