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New Member

H323 dropped calls (ISDN q931 Quality Of Service not available)

Hello all,

We have a problem with dropped calls inbound from BRIs. Calls are all of a sudden dropping with a

Quality Of Service not available message on ISDN q931 debugs.

-----------------relevant configuration--------------------------- full config is attached.

voice translation-rule 1

rule 1 /^.*\(...\)/ /2\1/

interface BRI0/0/0

description COMSAT1 Moviles

no ip address

isdn switch-type basic-net3

isdn overlap-receiving

isdn point-to-point-setup

isdn incoming-voice voice

isdn sending-complete

isdn static-tei 0

isdn skipsend-idverify

trunk-group licea1 2

!

interface BRI0/0/1

description COMSAT2 Moviles

no ip address

isdn switch-type basic-net3

isdn overlap-receiving

isdn point-to-point-setup

isdn incoming-voice voice

isdn sending-complete

isdn static-tei 0

isdn skipsend-idverify

trunk-group licea1 2

voice-port 0/0/0

translation-profile incoming voice

input gain -3

output attenuation -3

compand-type a-law

no comfort-noise

cptone ES

!

voice-port 0/0/1

translation-profile incoming voice

input gain -3

output attenuation -3

compand-type a-law

no comfort-noise

cptone ES

dial-peer voice 7100 pots

trunkgroup licea1

tone ringback alert-no-PI

translation-profile incoming voice

destination-pattern 6........

progress_ind setup enable 1

direct-inward-dial

forward-digits all

!

dial-peer voice 2000 voip

destination-pattern 2..

progress_ind setup enable 3

session target ipv4:192.26.2.253

voice-class codec 1

dtmf-relay h245-alphanumeric

no vad

!

From the debugs it appears to me that the call is being translated correctly we receive a 2XX inbound from the device and all I am doing is appending a 2 to the 2XX.

DNIS is 607345209 and ANI should be 2200. This seems to be working ok but when the 2000 voip dial-peer is hit (the dialpeer pointing to the cm) it appears there is a loop and I receive a error h323 internal socket error.

Please find attached the following debugs and thank you all in advanced for any assistance troubleshooting this problem.

4 REPLIES
Silver

H323 dropped calls (ISDN q931 Quality Of Service not available)

"Cause 49 / Code B1: Quality of Service not available"

CM can return code 49 for codec mismatch or transcoder allocation failure. alternatively it looks like this is the code that is used when RSVP reservation is required but fails.

---

Posted by WebUser JanMark Francisco

New Member

H323 dropped calls (ISDN q931 Quality Of Service not available)

We don´t have RSVP enabled. I´ve checked the transcoder and to me it seems fine. The only thing that I do notice is when I change the codec the call does not drop initially but after it is picked subsequent calls drop immediately with the qos message.

New Member

H323 dropped calls (ISDN q931 Quality Of Service not available)

I finally managed to figure out what was happening. Aparently somehow call fallback active was configured and was causing a call loop. This was causing for some reason the qos and h323 internal socket error messages. Removing this solved the problem.

I also deactive the call

I also deactive the call fallback active command and the Issue with the Disconnect Cause Code 49 was figure it out. 

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