Outbound calls taking some time to dial

Yannick Vranckx · ‎03-05-2014

Dear,

We are having a issue with outbound calls in Denmark.

When the customer wants to dial out to the PSTN it takes some time for the number to start dialling. I've already adjusted the T302 timer for this but that doesn't seem to be the issue.

The issue seems that the calls takes some time to form over to the PSTN.

I've done a debug trace of Q931 and from the moment he connects to the outside it takes a while for it to start ringing, i can start a detailed trace later today or tomorrow.

Are there any commands i could do to the E1 controller or the voiceport to speed up things, send a sending complete or something so the provider picks this up faster, or is this totally a provider issue?

Thanks,

Yannick

MUDIT MATHUR · ‎03-05-2014

Hi Yannick,

Please try to make the outbound call again and press "#" at the end of the call and check if the call still takes time to complete.

If the issue is still there then we need to collect the debugs on the gateway.

Thanks & Regards,
Mudit Mathur

Thanks & Regards, Mudit Mathur

Sreekanth Narayanan · ‎03-05-2014

Hi Yannick,

It depends on what you are seeing in the ISDN debugs:

If you see the following:

TX -> SETUP

RX <- Call Proceeding

..

Time delay

..

RX <- Alerting

Then it is an issue with the provider not routing the call immediately.

Also in the SETUP, you can check for the "Sending Complete", which means all digits have been mentioned in the called party and the call should be routed immediately.

Thanks

Sree

Yannick Vranckx · ‎03-06-2014

NYK01VG21#

Mar 6 10:52:40 CET: ISDN Se0/0/0:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x0, Calling num 54847070

Mar 6 10:52:40 CET: ISDN Se0/0/0:15 Q931: Sending SETUP callref = 0x0542 callID = 0x84C3 switch = primary-net5 interface = User

Mar 6 10:52:40 CET: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8 callref = 0x0542

Sending Complete

Bearer Capability i = 0x8090A3

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA9838C

Exclusive, Channel 12

Progress Ind i = 0x8183 - Origination address is non-ISDN

NYK01VG21#

Calling Party Number i = 0x0081, '54847070'

Plan:Unknown, Type:Unknown

Called Party Number i = 0x80, '003227551617'

Plan:Unknown, Type:Unknown

Mar 6 10:52:40 CET: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8 callref = 0x8542

Channel ID i = 0xA9838C

Exclusive, Channel 12

NYK01VG21#

Mar 6 10:52:50 CET: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8 callref = 0x8542

Progress Ind i = 0x8A81 - Call not end-to-end ISDN, may have in-band info

NYK01VG21#

Mar 6 10:52:54 CET: ISDN Se0/0/0:15 Q931: RX <- ALERTING pd = 8 callref = 0x8542

Progress Ind i = 0x8A88 - In-band info or appropriate now available

Mar 6 10:52:55 CET: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8 callref = 0x8542

Progress Ind i = 0x8A88 - In-band info or appropriate now available

NYK01VG21#

Mar 6 10:52:55 CET: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8 callref = 0x8542

Progress Ind i = 0x8A88 - In-band info or appropriate now available

NYK01VG21#

Mar 6 10:53:00 CET: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x0542

Cause i = 0x8090 - Normal call clearing

Mar 6 10:53:00 CET: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8 callref = 0x8542

Mar 6 10:53:00 CET: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x0542

NYK01VG21#

This is the output from the debug isdn q931, there is a 10 second delay between "Call Proc" and "Progress"

Anyone any ideas

Sreekanth Narayanan · ‎03-06-2014

Hi Yannick,

It's clear from your output that this is a telco issue.

Mar 6 10:52:40 CET: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8 callref = 0x8542

Channel ID i = 0xA9838C

Exclusive, Channel 12

NYK01VG21#

Mar 6 10:52:50 CET: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8 callref = 0x8542

Progress Ind i = 0x8A81 - Call not end-to-end ISDN, may have in-band info

NYK01VG21#

The provider will have to rectify the 10 second delay it takes for them to reach the number called.

The ringback will only begin once the progress information has been received and it will come in band from the telco.

Thanks

Sree