[cisco-nas] ISDN calls not making it to NM-6DM

[Mark Johnson (mljohnso)]

A bearer cap of 0x8890 means the call is digital, not analog, so the call is not being passed to a modem.  Your emulating network in between must be mucking with the bearer cap (check out debug on the 1841 to verify that it’s not originating at 8890).

mark

From: Tom Storey <tom at snnap.net<mailto:tom at snnap.net>>
Date: Friday, January 30, 2015 at 3:13 PM
To: "cisco-nas at puck.nether.net<mailto:cisco-nas at puck.nether.net>" <cisco-nas at puck.nether.net<mailto:cisco-nas at puck.nether.net>>
Subject: [cisco-nas] ISDN calls not making it to NM-6DM

Hi everyone.

Playing around with some old hardware in a lab, trying to get some ISDN calls originated from an 1841 with a WIC-1B-S/T-V3 to be answered on a 3825 with a NM-6D and NM-CE1T1-PRI.

Heres my config:

controller E1 1/0
 pri-group timeslots 1-6,16
!
interface Serial1/0:15
 no ip address
 encapsulation ppp
 isdn switch-type primary-net5
 isdn incoming-voice modem 64
 isdn bchan-number-order ascending
!
interface Group-Async0
 ip unnumbered Loopback0
 ip nat inside
 ip virtual-reassembly in
 encapsulation ppp
 peer default ip address pool dialup
 async mode interactive
 no keepalive
 ppp authentication chap callin
 group-range 2/0 2/5
!
line 2/0 2/5
 modem InOut
 autoselect ppp
!

And heres what I see when an ISDN call comes in:

*Jan 30 23:31:24.963 UTC: ISDN Se1/0:15 Q931: RX <- SETUP pd = 8  callref = 0x0183
Bearer Capability i = 0x8890
Standard = CCITT
Transfer Capability = Unrestricted Digital
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA98381
Exclusive, Channel 1
Calling Party Number i = 0x80, '0733944124'
Plan:Unknown, Type:Unknown
Called Party Number i = 0x80
Plan:Unknown, Type:Unknown
*Jan 30 23:31:24.963 UTC: ISDN Se1/0:15 Q931: Received SETUP  callref = 0x8183 callID = 0x01E5 switch = primary-net5 interface = User
*Jan 30 23:31:24.971 UTC: %ISDN-6-CONNECT: Interface Serial1/0:0 is now connected to 0733944124 N/A
*Jan 30 23:31:24.971 UTC: ISDN Se1/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x8183
Channel ID i = 0xA98381
Exclusive, Channel 1
*Jan 30 23:31:24.971 UTC: ISDN Se1/0:15 Q931: TX -> CONNECT pd = 8  callref = 0x8183
Channel ID i = 0xA98381
Exclusive, Channel 1
*Jan 30 23:31:24.979 UTC: ISDN Se1/0:15 Q931: RX <- CONNECT_ACK pd = 8  callref = 0x0183

So as far as I can tell the call comes in and establishes fine, but even with "debug modem" and a couple of other debugs on, I dont see any activity regarding connection to a modem. When I dial in from an analogue modem it works just fine.

FWIW I am using the 3825 as a PSTN simulator as well. The 1841 is connected to a VIC2-2BRI-NT/TE emulating network, and a dialpeer connects calls to a VWIC2-2MTF-E1 which is also emulating network and is connected to the NM-CE1T1-PRI.

Wondering if any one can provide any pointers to help me out. Am I missing something obvious?

Let me know if you require more information.

Thanks
Tom
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