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Beginner

Endbloc versus overlap receiving - ISDN call drop issue

Dear All

Hope some one would be able to help me here.

I have a problem with Telecom Italia NOT sending me the last 3 digit of the DID.

Example:

DID is 0651111XXX and Telco is supposed to send 651111XXX to gateway.

Most of the incoming calls to gateway works fine but but for some calls Telco sends only 651111 and they do not send XXX. When asked about this, they were suggesting that there could be a tmer in Cisco gateway which is timing out before Telco can actually send the full digits. So basically the endbloc dialling from mobile and landlines work; and digit by digit dialling does not.

Has anyone experienced a similar issue with Telecom Italia ?

I dont see any digits after 651111 in my gateway so I am not completely sure if TI is right.

Below is my configuration:

IT002# sh controll e1
E1 0/0/0 is up.
  Applique type is Channelized E1 - balanced
  Description: rhost="" rint="" tname="Telecom Italia"
  No alarms detected.
  alarm-trigger is not set
  Version info FPGA Rev: 08121917, FPGA Type: PRK4
  Framing is CRC4, Line Code is HDB3, Clock Source is Line.
  International Bit: 1, National Bits: 11111


controller E1 0/0/0
pri-group timeslots 1-31
trunk-group to-PSTN-PRI timeslots 1-31
description rhost="" rint="" tname="Telecom Italia
!
interface Serial0/1/0:15
no ip address
encapsulation hdlc
no logging event link-status
no snmp trap link-status
isdn switch-type primary-net5
isdn overlap-receiving T302 2000
isdn incoming-voice voice
isdn map address . plan unknown type unknown
isdn bchan-number-order ascending
no cdp enable
=================================================

I tried increasing the t302 timer as below but that did not help

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

interface Serial0/0/0:15
description rhost="" rint="" tname="Telecom Italia"
no ip address
encapsulation hdlc
no logging event link-status
isdn switch-type primary-net5
isdn overlap-receiving T302 5000
isdn incoming-voice voice
isdn bchan-number-order ascending
no cdp enable
!

Q931 debug below:

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8  callref = 0x4700

        Bearer Capability i = 0x8090A3

                Standard = CCITT

                Transfer Capability = Speech 

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA18393

                Preferred, Channel 19

        Progress Ind i = 0x8083 - Origination address is non-ISDN 

        Calling Party Number i = 0x2183, '49776XXX'

                Plan:ISDN, Type:National

        Called Party Number i = 0xA1, '651111'  >>> this is supposed to be 651111XXX

                Plan:ISDN, Type:National

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: Received SETUP  callref = 0xC700 callID = 0x0C5B switch = primary-net5 interface = User

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> SETUP_ACK pd = 8  callref = 0xC700

        Channel ID i = 0xA98393

                Exclusive, Channel 19

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0xC700

        Cause i = 0x8081 - Unallocated/unassigned number

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8  callref = 0x4700

Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0xC700

Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x4000

        Cause i = 0x8A9F - Normal, unspecified

        Progress Ind i = 0x8288 - In-band info or appropriate now available

Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: TX -> RELEASE pd = 8  callref = 0xC000

Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref = 0x4000

Oct  6 15:19:59: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x0B82

        Cause i = 0x8090 - Normal call clearingOct  6 15:19:47: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8  callref = 0x4700
        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech 
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA18393
                Preferred, Channel 19
        Progress Ind i = 0x8083 - Origination address is non-ISDN 
        Calling Party Number i = 0x2183, '49776XXX'
                Plan:ISDN, Type:National
        Called Party Number i = 0xA1, '651111'
                Plan:ISDN, Type:National
Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: Received SETUP  callref = 0xC700 callID = 0x0C5B switch = primary-net5 interface = User
Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> SETUP_ACK pd = 8  callref = 0xC700
        Channel ID i = 0xA98393
                Exclusive, Channel 19
Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0xC700
        Cause i = 0x8081 - Unallocated/unassigned number
Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8  callref = 0x4700
Oct  6 15:19:47: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0xC700
Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x4000
        Cause i = 0x8A9F - Normal, unspecified
        Progress Ind i = 0x8288 - In-band info or appropriate now available
Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: TX -> RELEASE pd = 8  callref = 0xC000
Oct  6 15:19:53: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref = 0x4000
Oct  6 15:19:59: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x0B82
        Cause i = 0x8090 - Normal call clearing

Could any one give me a sample working configuration for Telecom Italia, My gateway is H323.

Thanks in advance

Joseph

7 REPLIES 7
Highlighted
Advocate

Endbloc versus overlap receiving - ISDN call drop issue

Hi,

Have you tried removinf the overlap receive - at leat just to test

!

interface Serial0/1/0:15

no isdn overlap-receiving T302 2000

no isdn overlap-receiving

!

make sure you have a dial peer that matches the exact length of digits you expect to receive

dial-peer voice 11 voip

destination-pattern 65111...

session target ipv4:172.22.10.1

etc

etc

!

Hth

Alex

Regards, Alex. Please rate useful posts.
Highlighted
Beginner

Endbloc versus overlap receiving - ISDN call drop issue

Hi Alex

Thanks for the reply.

Sorry I pasted the wrong configuration in the above post.

My Original configuration was below:

interface Serial0/0/0:15

description rhost="" rint="" tname="Telecom Italia"

no ip address

encapsulation hdlc

no logging event link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bchan-number-order ascending

no cdp enable

!

I tried the below as well

interface Serial0/0/0:15
description rhost="" rint="" tname="Telecom Italia"
no ip address
encapsulation hdlc
no logging event link-status
isdn switch-type primary-net5
isdn overlap-receiving T302 5000
isdn incoming-voice voice
isdn bchan-number-order ascending
no cdp enable
!

Calls from mobile and many land lines  hits the gateway properly as 651111XXX  and routes to the correct phone using existing dialpeers but some calls from land lines hits the gateway as only 651111

Thanks

Joseph

Highlighted
Advocate

Endbloc versus overlap receiving - ISDN call drop issue

Joseph,

This sounds more like a TELCO issue.

I think you should ask them to retest with ISDNPRI Emulator (Tester like an TREND -AURORA etc) at the customer end

and prove to you that all digits are  being received for all calls that you can get placed.

Regards

Alex

Regards, Alex. Please rate useful posts.
Highlighted
Beginner

Endbloc versus overlap receiving - ISDN call drop issue

Joseph,

By default Cisco router works in Enblock dialing mode. Overlap receiving mostly  will work with 'ISDN swith type qsig' not with the primary-net5.

Since its an incoming call ,You may need to try changing the call proceeding timer

isdn t310

To set a timer for the call proceeding state, use the isdn t310 command interface configuration mode. To reset to the default, use the no form of this command.

isdn t310 msecs

no isdn t310

Syntax Description

msecs

Time, in milliseconds, that the router waits before disconnecting a call after receiving a call proceeding message. Range is 1 to 400000.

http://www.cisco.com/en/US/docs/ios/12_2/dial/command/reference/drfisl2.html#wp1140869

http://www.cisco.com/en/US/tech/tk801/tk133/technologies_tech_note09186a00800b48cb.shtml

Highlighted

Endbloc versus overlap receiving - ISDN call drop issue

Hi Joseph.

I experiencing this problem too.

Please let me know if you solved the issue and please hurry to share the solution.

Many thanks.

Giorgio.

Highlighted
Hall of Fame Master

Endbloc versus overlap receiving - ISDN call drop issue

You are responding to a two years old hread. Please open new thread for new problems, including all the relevant information.

Highlighted

Endbloc versus overlap receiving - ISDN call drop issue

Hello,

have you been able to solve the issue?

Thank you

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