T1 PRI D Channel

[mike-greene]

Hi,

Is it normal for calls to use channel 23 as a B channel?  I've never seen this before..

        Bearer Capability i = 0x8090A2

                Standard = CCITT

                Transfer Capability = Speech

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA98397

                Exclusive, Channel 23

        Calling Party Number i = 0x2180, 'xxxxxxxxxx'

                Plan:ISDN, Type:National

        Called Party Number i = 0x80, 'xxxxxxxxxx'

                Plan:Unknown, Type:Unknown

!

Global ISDN Switchtype = primary-ni

ISDN Serial0/0/0:23 interface

        dsl 0, interface ISDN Switchtype = primary-ni

    Layer 1 Status:

        ACTIVE

    Layer 2 Status:

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

    Layer 3 Status:

        6 Active Layer 3 Call(s)

        CCB:callid=8FDB, sapi=0, ces=0, B-chan=21, calltype=VOICE

        CCB:callid=8FDC, sapi=0, ces=0, B-chan=20, calltype=VOICE

        CCB:callid=8FE1, sapi=0, ces=0, B-chan=22, calltype=VOICE

        CCB:callid=9013, sapi=0, ces=0, B-chan=23, calltype=VOICE

        CCB:callid=9014, sapi=0, ces=0, B-chan=18, calltype=VOICE

        CCB:callid=EA9, sapi=0, ces=0, B-chan=1, calltype=VOICE

    Active dsl 0 CCBs = 6

    The Free Channel Mask:  0x8005FFFE

    Number of L2 Discards = 0, L2 Session ID = 229

    Total Allocated ISDN CCBs = 6

Thanks.

[Rob Huffman · Accepted solution]

Hi Mike,

Yes, a full PRI would have 23-B + 1-D channels so channel 23 would

carry voice traffic

Cheers!

Rob

"And if I should fall behind
Wait for me" - Springsteen

[mike-greene]

Thanks Rob,

I was always under the impression that channels 0-22 would be the 23 B channels and channel 23 would be the D channel for the PRI since is up/up and spoofing.

Mike

[Robert Thomas · Accepted solution]

Mike,

Timeslots and channels on the GW are not cardinal numbers (0-23) the gateway actualli account for them as (1-24) for an akward reason.

It's normal to see calls comming into channel 23, 24 would be a different story.

You can confirm this with your

pri-group timeslots 1-23, 24 command

[mike-greene]

Rob/Robert,

Thanks for the clarification. 

Mike