Problem E1 Intermitten

[Tommy .]

Hi All ,

I have Problem with E1 in Cisco Call Manager  ,  when outgoing call using E1 in phone ,status is always busy 

here is the debug q931

Jan 27 06:04:13.459: ISDN Se0/3/0:15 Q931: TX -> SETUP pd = 8  callref = 0x008B

        Bearer Capability i = 0x8090A3

                Standard = CCITT

                Transfer Capability = Speech 

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA9839F

                Exclusive, Channel 31

        Called Party Number i = 0x80, '081381XXXXX'

                Plan:Unknown, Type:Unknown

*Jan 27 06:04:13.495: ISDN Se0/3/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref = 0x808B

        Cause i = 0x82AC - Requested circuit/channel not available

and when I check debug q921 here is what i got :

*Jan 27 06:02:30.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:31.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:32.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:33.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:34.271: ISDN Se0/3/0:15 Q921: User RX <- RRp sapi=0 tei=0 nr=13

*Jan 27 06:02:34.271: ISDN Se0/3/0:15 Q921: User TX -> RRf sapi=0 tei=0 nr=15

*Jan 27 06:02:34.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:35.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:37.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:38.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:39.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:40.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:41.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:42.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:43.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:44.271: ISDN Se0/3/0:15 Q921: User TX -> RRp sapi=0 tei=0 nr=15

*Jan 27 06:02:44.283: ISDN Se0/3/0:15 Q921: User RX <- RRp sapi=0 tei=0 nr=13

*Jan 27 06:02:44.283: ISDN Se0/3/0:15 Q921: User TX -> RRf sapi=0 tei=0 nr=15

*Jan 27 06:02:44.287: ISDN Se0/3/0:15 Q921: User RX <- RRf sapi=0 tei=0 nr=13

*Jan 27 06:02:44.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:45.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:46.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:47.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

*Jan 27 06:02:48.311: ISDN Se0/3/0:15 Q921: User RX <- SABMEp sapi=0 tei=13

I wonder where is the problem , while my e1 status

ISDN Serial0/3/0:15 interface

        dsl 1, interface ISDN Switchtype = primary-net5

    Layer 1 Status:

        ACTIVE

    Layer 2 Status:

        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

    Layer 3 Status:

        0 Active Layer 3 Call(s)

    Active dsl 1 CCBs = 0

    The Free Channel Mask:  0xFFFF7FFF

    Number of L2 Discards = 0, L2 Session ID = 10

    Total Allocated ISDN CCBs = 0

and E1 is up

anyone kindly help ?

[Carlo Poggiarelli]

Hi Tommy.

On CUCM, try to change b-channel selection to bottom-up

HTH

Regards

Carlo

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"The more you help the more you learn"

[Nadeem Ahmed]

Also you can adding one command since this h.323 GW

interface serial XX

isdn nego b-chan

isdn b-chan ascending

Br,
Nadeem 

Please rate all useful post.

[Carlo Poggiarelli]

Hi Nadeem.

From posted config I see

pri-group timeslots 1-31 service mgcp

So it seems to be MGCP controlled not H323.

Regards

Carlo

Please rate all helpful posts

"The more you help the more you learn"

[Nadeem Ahmed]

that's my bad, i thought it was h.323.

Br,
Nadeem 

Please rate all useful post.

[Tommy .]

HI Carlo ,

In the CUCM E1 Gateway i have already config channel to bottom-up or top-down but no result ,

but when outgoing E1 never change  channel other than 1 when setting top-down , and never change channel other than 31 when i set bottom-up

i have used command

isdn service b_channel 1 state 2

to force it use another channel , but the outgoing call can not procceed , and in debug isdn q931 not showing anything.

when i change isdn service b_channel 1 state 0 , debug isdn q931 out but showing no requested channel.

best regards,

Tommy

[Tommy .]

Hi Nadeem,

I Already enable the network select

Network Clock Configuration

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 0/3/0        GOOD            E1         

    10          Backplane       GOOD            PLL        

  Current Primary Clock Source

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 0/3/0        GOOD            E1         

but still outgoing status requested circuit/channel not available

regards,

Tommy

[j.huizinga]

Hi,

You get a RX "Requested circuit/channel not available" after a TX from your side.

I would contact the provider.

If the E1 is MGCP controlled you might try to enable "Inhibit restarts at PRI initialization" (unselect it)

After a reset the CM will request each channel, and the provider should aknowledge this.

I the cases I had this error, it was always a provider issue.

Bye,

Jan

[Aman Soi]

Hi Tommy,

Is SLIPs and errors problem resolved?

can u run the command show isdn service on router to check the channel status?

regds,

aman

[Tommy .]

Hi aman ,

nope the slip error still same , i have replaced the E1 port to another E1 but the result still same .

show isdn service

PRI Channel Statistics:

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 1. Layer 3 output may not apply

ISDN Se0/3/0:15, Channel [1-31]

  Configured Isdn Interface (dsl) 1

   Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)

    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

    State   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

   Service State (0=Inservice 1=Maint 2=Outofservice 8=MaintPend 9=OOSPend)

    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

    State   :  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

regards,

Tommy

[Tommy .]

Hi Jay,

I have contact the provider , and provider have confirm they have opened the channel from their side.

I have tried "Inhibit restarts at PRI initialization" but the result is still same .

Regards,

Tommy

[j.huizinga · Accepted solution]

Hi,

Believe me it's a provider issue.

Provider sends a RX, 'channel not available'. Provider has to tell you why they send this message. There must be a reason for it. And again, THEY send this message! Not you!

Several years ago I had a similar issue, and customer wanted to throw out Cisco, because provider says they are not blocking channels etc, finally customer wanted to sue provider, and then provider changed some equipment and all was solved.

And 1 year ago, with another customer, same issue. Provider says, they don't block channels, I told my customer, that it is a problem with the provider, and I can do nothing, and it's up to customer and provider.

After a week or so engineer from provider comes on site, does something and viola, it works! (a year without issues now)

Good luck!

Bye,

Jan

[Aman Soi]

Hi Tommy,

As suggested by Jan , can't you ask Telco to check the E1 link through BERT?

regds,

aman