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

[Mark Johnson (mljohnso)]

Yeah, the DM’s are only going to terminate analog calls.  As Josh says (long time, Josh!), configure the PRI (or use Legacy DDR or Dialer Profiles) and you should be good.

mark

From: joshd <jduffek at gmail.com<mailto:jduffek at gmail.com>>
Date: Friday, January 30, 2015 at 3:52 PM
To: Tom Storey <tom at snnap.net<mailto:tom at snnap.net>>
Cc: Mark Johnson <mljohnso at cisco.com<mailto:mljohnso at cisco.com>>, "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: Re: [cisco-nas] ISDN calls not making it to NM-6DM

If you just want to make it work, you can configure your IP stuff on the serial1/0:15 interface and the call should terminate there.  ISDN to ISDN like.

Not sure how you would simulate a real analog modem type call from the 1841 side with what you have.

I could be wrong though, been a while...

jd.

On Fri, Jan 30, 2015 at 5:32 PM, Tom Storey <tom at snnap.net<mailto:tom at snnap.net>> wrote:
Hi Mark, did not expect such a quick response!

Indeed it is originating from the 1841 as 8890.

I also re-configured the 1841 to do DoV, where the bearercap changed to 0x8090A3, and this was also seen as the incomming bearercap on the 3825.

I was under the impression from my reading that the NM-xDM could also terminate ISDN data calls, or have I got that wrong?

Cheers!

On 30 January 2015 at 23:27, Mark Johnson (mljohnso) <mljohnso at cisco.com<mailto:mljohnso at cisco.com>> wrote:
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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