unable to complete PSTN calls with IP-9971 phones

[yellomello]

Hi everybody,

I am trying to make PSTN calls with 9971 phones but this does not work because of invalid Transfer Capability.

I have also tried to add the "bearer-cap speech" command to the voice ports but this doesn't helped. Still the same scenario.

The design is that a Session Manager Edition is in control of 3945 voice gateways with E1 PRIs connected. Protocol is MGCP.

Does anybody has an idea how to resolve it globally?

Here is an output of the debug isdn q931.

062480: .Jul 20 13:56:18.946 MEST: ISDN Se2/0:15 Q931: TX -> SETUP pd = 8  callref = 0x3C8C

      Sending Complete

      Bearer Capability i = 0x8890

                      Standard = CCITT

                      Transfer Capability = Unrestricted Digital

                      Transfer Mode = Circuit

                      Transfer Rate = 64 kbit/s

      Channel ID i = 0xA9839F

                      Exclusive, Channel 31

      Calling Party Number i = 0x2181, '2102XXXXXXX'

                      Plan:ISDN, Type:National

      Called Party Number i = 0x91, '49XXXXXXXXXX'

                      Plan:ISDN, Type:International

062481: .Jul 20 13:56:18.982 MEST: ISDN Se2/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0xBC8C

      Channel ID i = 0xA9839F

                      Exclusive, Channel 31

062482: .Jul 20 13:56:19.591 MEST: ISDN Se2/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0xBC8C

      Cause i = 0x80D8 - Incompatible destination

Any help would be appreciated :-)

Thanks!

[Payal Bhaduri]

Hi,

The disconnect cause code can be commonly caused by the following :

The switch may not like "3.1khz" and expect to see "speech" the bearer caps

The switch may not like the  "Plan and Type"

D8

Incompatible destination

This cause indicates an attempt to connect to non-ISDN equipment. For

example, an analog line.

This cause indicates that the equipment receives a request to establish a

call that has a low layer compatibility, high layer compatibility, or other

compatibility attributes (for example, data rate) that the equipment cannot

accommodate.

This code often appears when the calling device dials the wrong number, and

reaches a non-ISDN device. Therefore, ensure that you dial the correct

number.

This cause can also occur when a a data call is made to a voice number, or a

voice call is made to a number that only supports data. If the number is

correct, check whether the telco has configured their switch incorrectly.

[yellomello]

Hi Payal,

thanks for the informational answer.

The problem I see is that the same call scenario with another type of phone (7961, 7962, 7942) works absolutely fine.

So I would suggest that the "Plan and Type" is correct. Also I saw enough calls crossing the gateway to PSTN with "3.1khz", so I would suggest that this also fine.

It definitely relies on the IP-Phone models 9971 with video capability enabled.

The question is how this can be fixed?

Maybe it is also a kind of a bug because the phone or the call manager should notice at least that the call is going out via a E1, so it has to be speech and not video. What do you think ?

[Payal Bhaduri]

Hi,

Did you add bearer-cap speech under the voice ports and do a shut no shut ?

Also i would suggest you contact the provider as the disconnect is sent by them.

[pmvillarama]

Hi,

I encountered this problem that occurs only in video capable phones. Adding bearer-cap speech under voice-port fixed the issue. no need to shut the voice port.

[pmvillarama]

Hi,

Sorry as you've already mentioned that it didn't fixed the issue. Can you post here the whole phone configuration page of the 9971 ip phone?

[yellomello]

Hi,

thanks for the answers so far.

I guess I have found now the problem for this.

On the gateway configuration page I found that an option called "Enable G.Clear" is active.

After disabling that for test purposes the call was fine - even without to activate "bearer-cap speech" command ;-)

However, due to problems in the past we need this to be active. The background is that customers will dial in via an ISDN card into a connected Siemens PBX. Don't ask me what the are doing then but this needs to be active :-)

The problem now is how can I do it that I can call PSTN numbers with the 9971 without to deactive the option "Enable G.Clear" ? :s

Any help or advice on this is very appreciated, otherwise I need to contact TAC.