[cisco-voip] ISDN call takes long time before connecting

[Abebe Amare]

Hi,

I am having a hard time convincing the local telco that outgoing calls to
PSTN numbers take about 11 seconds before the voice router receives
CALL_PROC from their switch. They insist this is normal and want to dismiss
the case but the delay is noticeable. Incoming calls have no problem.
The PRI line comes using microwave media due to lack of copper last mile to
the site and it connects to Cisco 2901 voice router which connects to CUCM
using SIP.
I have sent them the output of 'debug isdn q931' as follows:

*Oct 11 11:48:12.999: ISDN Se0/2/0:15 Q931: Applying typeplan for sw-type
0x12 is 0x2 0x1, Calling num xxxxxxxxx
*Oct 11 11:48:12.999: ISDN Se0/2/0:15 Q931: Sending SETUP  callref = 0x00C2
callID = 0x8043 switch = primary-net5 interface = User
*Oct 11 11:48:13.003: ISDN Se0/2/0:15 Q931: TX -> SETUP pd = 8  callref =
0x00C2
        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA9839F
                Exclusive, Channel 31
        Calling Party Number i = 0x2180, 'xxxxxxxxx'
                Plan:ISDN, Type:National
        Called Party Number i = 0x81, 'yyyyyyyyy
                Plan:ISDN, Type:Unknown
*Oct 11 11:48:13.295: ISDN Se0/2/0:15 Q931: RX <- SETUP_ACK pd = 8  callref
= 0x80C2
        Channel ID i = 0xA9839F
                Exclusive, Channel 31
*Oct 11 11:48:24.167: ISDN Se0/2/0:15 Q931: RX <- CALL_PROC pd = 8  callref
= 0x80C2
*Oct 11 11:48:31.127: ISDN Se0/2/0:15 Q931: RX <- ALERTING pd = 8  callref
= 0x80C2
        Progress Ind i = 0x8488 - In-band info or appropriate now available
*Oct 11 11:48:39.975: ISDN Se0/2/0:15 Q931: RX <- CONNECT pd = 8  callref =
0x80C2
        Connected Number i = '!', 0x83, 'yyyyyyyyy'
*Oct 11 11:48:39.975: ISDN Se0/2/0:15 Q931: TX -> CONNECT_ACK pd = 8
 callref = 0x00C2
*Oct 11 11:49:06.119: ISDN Se0/2/0:15 Q931: TX -> DISCONNECT pd = 8
 callref = 0x00C2
        Cause i = 0x8090 - Normal call clearing
*Oct 11 11:49:06.423: ISDN Se0/2/0:15 Q931: RX <- RELEASE pd = 8  callref =
0x80C2
*Oct 11 11:49:06.423: ISDN Se0/2/0:15 Q931: TX -> RELEASE_COMP pd = 8
 callref = 0x00C2

Is there anything I can do from my side to lower this delay?

best regards,

Abebe
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