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Bearer Capability issue on 2600

Hi all,

I am expericing problem with the cisco 2600, which should function as the sip2pstn gateway. If I try to complete a call from a sip phone to pstn, the router says:


00:15:49: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x03

00:15:49: Bearer Capability i = 0x8090A2


00:15:49: Channel ID i = 0x83

00:15:49: Progress Ind i = 0x8181 - Call not end-to-end ISDN, may have in-band info

00:15:49: Calling Party Number i = 0x80, 'rickan', Plan:Unknown, Type:Unknown

00:15:49: Called Party Number i = 0xC9, '6091574', Plan:Private, Type:Subscriber(local)

00:15:49: ISDN BR1/0: RX <- SETUP_ACK pd = 8 callref = 0x83

00:15:49: Channel ID i = 0x89

00:15:49: Progress Ind i = 0x8188 - In-band info or appropriate now available

00:15:49: ISDN BR1/0: RX <- DISCONNECT pd = 8 callref = 0x83

00:15:49: Cause i = 0x80C1 - Bearer capability not implemented


00:15:49: Progress Ind i = 0x8188 - In-band info or appropriate now available


Please notice the line "Bearer Capability i = 0x8090A2", the digits "80" mean that this is a ITU voice call, "90" mean circuit mode, 64 kbps and "A2" is for G.711 u-law.

So if I call the router from a normal telephone, the debugging looks as follows:


01:01:58: ISDN BR1/0: RX <- SETUP pd = 8 callref = 0x01

01:01:58: Bearer Capability i = 0x8090A3


01:01:58: Channel ID i = 0x89

01:01:58: Calling Party Number i = 0x0181, '609157', Plan:ISDN, Type:Unknown

01:01:58: Called Party Number i = 0xC1, '20', Plan:ISDN, Type:Subscriber(local)

01:01:58: High Layer Compat i = 0x9181

01:01:58: ISDN BR1/0: Event: Received a VOICE call from 609157 on B1 at 64 Kb/s


whereat the bearer capability is "0x8090A3". It means that the ISDN-switch of German Telekom uses G.711 a-law.

I am afraid that is the reason why the sip-call doesn't go through. But I can't find any way to configure this.

Has anybody in this mailinglist the same experience?

Any hints would be very appreciated.



P.S. I tried both IOS 12.2(12a) and 12.1.5.T10

Community Member

Re: Bearer Capability issue on 2600


a few times alreadty i have seen disconnects with the reason "bearer cap not implemented", and it took just a codec change on either sides to resolve the problem. but assuming yoru issue drills down to layer 1 protocols (u-law vs a-law), i will point you to the translation profile/rule in global config mode. i have come across sub-commands down there that allow you to manipulate some of these parameters, but i haven't investigated deep enough to confirm whether these commands satisfy your request. nevertheless it is a start.

On a side note, my company does have a softswitch that allows you to manipulate all these parameters over IP before the call reaches the destination. if you are intersted, send me a mail and i will give you more info.


Cisco Employee

Re: Bearer Capability issue on 2600

First need to know that country where this 2600 is located in to. Based on that we can see the standards of a-law or u-law.

Now when the call go out from 2600 (sip-2-pstn) over pri line, was disconnected by PSTN with bearercap 8090A2 issue.

But does the incoming call (pstn-2-sip) in to gateway 2600 over pri line with bearer cap 8090A3 works fine?

You can use "compand-type a-law" (or u-law) under the voice-port config if you want to change the compand-type

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