[Serusers] problem with cisco 2600 to pstn

[Yang Xiang]

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, 'yang2', 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.

Thanks

yang