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

[Bill Paris]

It sounds like Bell is waiting for more digits. Sending a # after sending the number may resolve this issue.
 
Bill
 


 
 
Bill Paris
Network Engineer
Delaware North Companies
40 Fountain Plaza
Buffalo NY 14202
(716) 858-5312
>>> Abebe Amare <abucho at gmail.com> 10/14/2014 10:21 AM >>>
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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