[cisco-voip] CCM3.3 - MGCP - Q.Sig

[Martin Lohnert]

Hey everyone,
another one of these 'things' that aren't making any sense to me: a customer
using C2651XM with an ISDN PRI to their legacy PBX, running Q.sig and the
router as a h.323 gateway without problems. Recently a decision has been
made to implement calling name transfers on this line and thus switch to
MGCP. From my point of view, nothing needs to be changed on the PBX, as
they're using Q.sig already.

Now, after switching to MGCP, all calls fail, since we drop them with "Cause
i = 0x80D1 - Invalid call reference value." Q.931 translator shows:
=============================
12/23/2005 11:43:21.737 CCM
RX <- SEGMENT pd = 8  callref = 0x000C
Segmented Message i = 0x0105
Bearer Capability i =
0x2A8003313030020302676480033130300203026765A00980010181010182010AA10980010181010182010A1C1D9FAA06
RESERVED = 00x80
IE out of order or end of private IEs --
UNRECOGNIZED VARIABLE: 0x01 i =
RESERVED = 20x82
UNRECOGNIZED VARIABLE: 0x01 i =
RESERVED = 110x8B
UNRECOGNIZED VARIABLE: 0x01 i =
Sending Complete
UNRECOGNIZED VARIABLE (0x0F) i = 0x02D8
IE 0xC0
IE out of order or end of private IEs --
UNRECOGNIZED VARIABLE (0x02) i = 0x55
UNRECOGNIZED VARIABLE (0x30) i = 0x820406400840
IE out of order or end of private IEs --
Facility i =
0x9FAA068001008201008B0102A1300202D8D006082B0C02885302010D3020801E090A02000202020202020101010101010103020101010000000000000000
Facility i = 0x9FAA068001008201008B0100A1090202D8E00201008400
Facility i = 0x9FAA068001008201018B0100A1340202D8F006082B0C0288
     Decode Error: IE Length Error (0x42)
=============================
12/23/2005 11:43:21.737 CCM
TX -> RELEASE_COMP pd = 8  callref = 0x800C
Cause i = 0x80D1 - Invalid call reference value
=============================

If I understand this correctly, CCM doesn't recognize the incoming SETUP
correctly? We're running CCM 3.3.3sr2 and 12.3.4T2 on the gateway.We had to
switch back to h.323 and everything works fine again... How do we make CCM
understand this scenario? Upgrade CCM/IOS ?

Cheers & Happy 2006.
ML
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