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Participant

incoming calls on ISDN BRI delayed in proceeding

Hi,

we have an Cisco 2911 voice gateway configured with 6 BRI Interfaces and connected to an CUCM 8.0.3

Incoming calls from PSTN are delayed in call proceeding by round about 14 seconds! Here is a debug of this:

Jun 10 09:00:41.317: ISDN BR0/1/1 Q931: RX <- SETUP pd = 8  callref = 0x55

        Bearer Capability i = 0x8090A3

                Standard = CCITT

                Transfer Capability = Speech

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0x89

                Exclusive, B1

        Calling Party Number i = 0x2181, '39982XXXXX'

                Plan:ISDN, Type:National

        Called Party Number i = 0xC1, 'XXXX142'

                Plan:ISDN, Type:Subscriber(local)

        High Layer Compat i = 0x9181

Jun 10 09:00:41.317: ISDN BR0/1/1 Q931: TX -> SETUP_ACK pd = 8  callref = 0xD5

        Channel ID i = 0x89

                Exclusive, B1

Jun 10 09:00:56.321: ISDN BR0/1/1 Q931: TX -> CALL_PROC pd = 8  callref = 0xD5

Jun 10 09:00:56.337: ISDN BR0/1/1 Q931: TX -> ALERTING pd = 8  callref = 0xD5

You can see the delay between TX -> SETUP_ACK and TX -> CALL_PROC. There a 15 Seconds while the caller no hear ringback tone.

What can be the reason of this?

Here is a sample of BRI Interface configuration:

interface BRI0/0/0

no ip address

isdn switch-type basic-net3

isdn overlap-receiving

isdn point-to-point-setup

isdn incoming-voice voice

isdn send-alerting

isdn static-tei 0

Can somebody help?

9 REPLIES 9
Highlighted
Hall of Fame Master

Which exact IOS are you using?

DP config ?

Highlighted

IOS is

(C2900-UNIVERSALK9-M), Version 15.1(4)M

Dial-Peer:

dial-peer voice 1 pots

description incoming from PSTN

incoming called-number .

direct-inward-dial

!

dial-peer voice 10 voip

description to CUCM

destination-pattern 12345T

modem passthrough nse codec g711alaw

session target ipv4:192.168.161.240

voice-class codec 1

voice-class h323 1

dtmf-relay h245-alphanumeric

fax-relay ecm disable

fax protocol pass-through g711alaw

no vad

no supplementary-service h225-notify cid-update

!

Highlighted

On the voip dial peer make it a pattern match, something like:-

destination-pattern 12345...

Hope this helps,

Craig

(PLEASE RATE HELPFUL POSTS)

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Craig Dyer wrote:

On the voip dial peer make it a pattern match, something like:-

destination-pattern 12345...


I think they used T believing it is needed to support different lenght called numbers and presence overlap-receiving.

In reality, what is needed, in these cases is avoid overlapping numbers, and use separate DPs.

Highlighted
Beginner

Hi,

Had this issue resolved? We have same problem in our network.

Please help me with the resolution if you have already got it.

Appreciate your help.

Regards,

Sanadh

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Can you send you sh run here and a

debug voip ccapi inout

Please rate all useful posts
Highlighted

Hi,

Thanks for your immediate response.

Issue resolved now. It was dial-peer issue. Our subscriber CUCM 10.99.4.1 is down and not in cluster.

So going to next dial-peer (dial-peer voice 8 voip) was taking 15 seconds.

dial-peer voice 7 voip

destination-pattern 3096....

progress_ind setup enable 1

progress_ind progress enable 1

progress_ind connect enable 1

progress_ind disconnect enable 8

session target ipv4:10.99.4.1

incoming called-number .

dtmf-relay h245-alphanumeric

codec g711ulaw

!

dial-peer voice 8 voip

preference 1

destination-pattern 3096....

progress_ind setup enable 1

progress_ind progress enable 1

progress_ind connect enable 1

progress_ind disconnect enable 8

session target ipv4:10.99.4.2

incoming called-number .

dtmf-relay h245-alphanumeric

codec g711ulaw

!

Thanks & Regards,

Sanadh

Highlighted

Sanadh,

To avoid this in the future configure the following

voice class h323 1

h225 timeout tcp establish 3

dial-peer voice 7 voip

voice-class h323 1

WIth this command when the primary callmanager on dial-peer 7 is down, the next callmanager on dial-peer 8 will be tried within 3 secs.

Pls rate useful posts

Please rate all useful posts
Highlighted

Thank you for the valuable input, i will configure the same in voice gateway.

This will help us to avoid delay in calls, if the primary dial-peer is not matched.

Thanks & Regards,

Sanadh

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