[cisco-voip] Calls not completing to some mobile prefixes

[kevin gannon]

We have a E1 trunk to a mobile carrier for cheaper calls. Some blocks
of numbers will not complete/connect. However if we ring the number
via a trunk to another carrier it works fine.

My hunch is we are disconnecting because we are not getting ALERTING
back quickly enough. However looking at the T timers I can not see one
that might be causing the issue. Looking for suggestions/ideas ?

It is callmanager 6 and it is an IOS gateway being controlled by MGCP.

########################Working Call################################
#debug isdn
Mar 18 10:57:24.250 GMT: ISDN Se4/1:15 Q931: TX -> SETUP pd = 8
callref = 0x00B3
	Bearer Capability i = 0x8090A3
		Standard = CCITT
		Transfer Capability = Speech
		Transfer Mode = Circuit
		Transfer Rate = 64 kbit/s
	Channel ID i = 0xA9839C
		Exclusive, Channel 28
	Calling Party Number i = 0x0181, '6554'
		Plan:ISDN, Type:Unknown
	Called Party Number i = 0x80, '0xxxxxx'
		Plan:Unknown, Type:Unknown

Mar 18 10:57:24.434 GMT: ISDN Se4/1:15 Q931: RX <- CALL_PROC pd = 8
callref = 0x80B3
	Channel ID i = 0xA9839C
		Exclusive, Channel 28

Mar 18 10:57:24.438 GMT: ISDN Se4/1:15 Q931: RX <- PROGRESS pd = 8
callref = 0x80B3
	Progress Ind i = 0x8088 - In-band info or appropriate now available

Mar 18 10:57:28.482 GMT: ISDN Se4/1:15 Q931: ALERTING pd = 8  callref = 0x80B3

Mar 18 10:57:44.335 GMT: ISDN Se4/1:15 Q931: CONNECT pd = 8  callref = 0x80B3


Mar 18 10:57:45.835 GMT: ISDN Se4/1:15 Q931: RELEASE pd = 8  callref = 0x80B3





#############################Failed call:##############################


Mar 18 10:56:52.382 GMT: ISDN Se4/1:15 Q931: TX -> SETUP pd = 8
callref = 0x00B2
	Sending Complete
	Bearer Capability i = 0x8090A3
		Standard = CCITT
		Transfer Capability = Speech
		Transfer Mode = Circuit
		Transfer Rate = 64 kbit/s
	Channel ID i = 0xA9839C
		Exclusive, Channel 28
	Calling Party Number i = 0x0181, '8343'
		Plan:ISDN, Type:Unknown
	Called Party Number i = 0x80, '0xxxxxx'
		Plan:Unknown, Type:Unknown
		
Mar 18 10:56:52.534 GMT: ISDN Se4/1:15 Q931: RX <- CALL_PROC pd = 8
callref = 0x80B2
	Channel ID i = 0xA9839C
		Exclusive, Channel 28

Mar 18 10:56:52.538 GMT: ISDN Se4/1:15 Q931: RX <- PROGRESS pd = 8
callref = 0x80B2
	Progress Ind i = 0x8088 - In-band info or appropriate now available

Mar 18 10:56:55.930 GMT: ISDN Se4/1:15 Q931: TX -> DISCONNECT pd = 8
callref = 0x00B2
	Cause i = 0x8090 - Normal call clearing

Mar 18 10:56:56.234 GMT: ISDN Se4/1:15 Q931: RX <- RELEASE pd = 8
callref = 0x80B2
Mar 18 10:56:56.246 GMT: ISDN Se4/1:15 Q931: TX -> RELEASE_COMP pd = 8
 callref = 0x00B2