Problem with isdn overlap-receiving

David Wagner · ‎05-22-2009

Hi,

i'm experiencing confusing problems with our isdn bri connection in italy. the main number ends with '60'. our did range is '600' until '619'. But on incoming calls, the called party ends always with '60'. And the confusing thing is, the gateway receives the missing digit(s) after the ISDN 'disconnect' message (sending-complete)

############################

the interface config

--------------------------

isdn switch-type basic-net3

isdn overlap-receiving t302 20000

isdn incoming-voice voice

isdn send-alerting

isdn sending-complete

isdn outgoing-voice info-transfer-capability 3.1kHz-audio

isdn static-tei 0

trunk-group 1

################################

#################################

debug isdn q931 for an incoming call

to DID '607'

--------------------------

May 22 08:36:48.111: ISDN BR0/0/1 Q931: RX <- SETUP pd = 8 callref = 0x5C

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 = 0x2183, '4713064'

Plan:ISDN, Type:National

Called Party Number i = 0xA1, '47159860'

Plan:ISDN, Type:National

May 22 08:36:48.119: ISDN BR0/0/1 Q931: TX -> SETUP_ACK pd = 8 callref = 0xDC

Channel ID i = 0x89

Exclusive, B1

May 22 08:36:48.151: ISDN BR0/0/1 Q931: TX -> DISCONNECT pd = 8 callref = 0xDC

Cause i = 0x8090 - Normal call clearing

BRI-VG1#

May 22 08:36:48.195: ISDN BR0/0/1 Q931: RX <- INFORMATION pd = 8 callref = 0x5C

Sending Complete

Called Party Number i = 0xA1, '7'

Plan:ISDN, Type:National

May 22 08:36:48.319: ISDN BR0/0/1 Q931: RX <- RELEASE pd = 8 callref = 0x5C

May 22 08:36:48.323: ISDN BR0/0/1 Q931: TX -> RELEASE_COMP pd = 8 callref = 0xDC

David Wagner · ‎05-22-2009

Hi,

i resolved the problem:

i configured 'isdn overlap-receiving' instead of 'isdn overlap-receiving t302' on the interface.

but what is the difference between these both commands?

bigcappa1 · ‎05-22-2009

Max,

Hopefully this doc will help explain but the T302 is the interdigit timout. After the T302 part of the command you can also add a value in ms if you wish to remove it from the default which is 10secs, which can be a little long in cases

http://www.cisco.com/application/pdf/paws/23382/isdn_overlap_prob.pdf

Hope this helps

Paul

paolo bevilacqua · ‎05-22-2009

When you receive this message:

BRI-VG1#

May 22 08:36:48.195: ISDN BR0/0/1 Q931: RX <- INFORMATION pd = 8 callref = 0x5C

Sending Complete

Called Party Number i = 0xA1, '7'

Plan:ISDN, Type:National

it does NOT mean that sending complete is BEFORE the called digit. That is just the way it is printed.

It means that you have received the last digit.