Fast busy sending call to H.323 GW

[jeffrey.girard]

CM 4.2(3) connected to 3825 with MultiFLex T1 card connected to Avaya PBX. Originally, the router was an H.323 GW and the T1 was a DS0/CAS circuit. I was able to offnet calls fine. Then to set up for E911, we changed the T1 to a PRI. Avaya operator changed his end, I changed the router config. Sh voice port summary and sh controller indicates all is good. I went to the CM and the GW. Now, calls going to the GW get fast busy.

Config below as well as show commands. I trimmed the show run:

!

isdn switch-type primary-ni

voice-card 0

dspfarm

dsp services dspfarm

!

!

!

!

controller T1 0/0/0

framing esf

linecode b8zs

pri-group timeslots 1-24

!

controller T1 0/0/1

framing esf

linecode b8zs

!

!

!

!

interface GigabitEthernet0/0

description Link to 008

duplex auto

speed auto

media-type rj45

negotiation auto

h323-gateway voip interface

h323-gateway voip h323-id 3825-1

h323-gateway voip tech-prefix 1#

h323-gateway voip bind srcaddr xxx.xxx.xxx.xxx

!

interface GigabitEthernet0/1

no ip address

shutdown

duplex auto

speed auto

media-type rj45

negotiation auto

interface Serial0/0/0:23

no ip address

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

control-plane

!

!

!

voice-port 0/0/0:23

echo-cancel enable type hardware

!

!dial-peer voice 1 pots

description Dial Peer for Outbound 4 digit on post dialing

destination-pattern ....

forward-digits all

!

On the CM, the GW window shows the GW, known by its IP address, device protocol H.225, and registration unknown

[pcameron]

On the router, do a SH ISDN status. If it has correct layer 1 operation, it should be in Multi Frame Established.

Next, enable 'debug isdn q921' and do a shut/no shut on the T1 controller. Capture these logs, then turn off these debugs.

Finally, enable 'debug isdn q931' and make a test call through the gateway and capture these logs. Post them here so we can go through them.

[jeffrey.girard]

OK, looks like I have a Layer 2 issue. Sho ISDN status indicates that the state is alternating between TEI_Assigned/Awaiting_Establishment

Show ISDN Status below:

3825-1#sh isdn status

Global ISDN Switchtype = primary-ni

ISDN Serial0/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 176

Total Allocated ISDN CCBs = 0

[paolo bevilacqua]

Hi,

router needs to be ISDN network-side:

int Serial0/0/0:23

isdn protocol-emulate network

Hope this helps, please rate post if it does!

[jeffrey.girard]

OK, last post from p.bevilacqua fixed my L1/L2 problem - I now have MultiFrame Established. I have run the debugs as requested by a previous poster. Debug isdn q921 is below. Debug q931 and then placing a call produced not debug output

3825-1#debug isdn q921

debug isdn q921 is ON.

*Jan 23 16:40:09.987: ISDN Se0/0/0:23 Q921: Net RX <- RRp sapi=0 tei=0 nr=48

*Jan 23 16:40:09.991: ISDN Se0/0/0:23 Q921: Net TX -> RRf sapi=0 tei=0 nr=48conc t ft t

*Jan 23 16:40:20.055: ISDN Se0/0/0:23 Q921: Net RX <- RRp sapi=0 tei=0 nr=48

*Jan 23 16:40:20.055: ISDN Se0/0/0:23 Q921: Net TX -> RRf sapi=0 tei=0 nr=48f t

*Jan 23 16:40:30.119: ISDN Se0/0/0:23 Q921: Net RX <- RRp sapi=0 tei=0 nr=48

*Jan 23 16:40:30.119: ISDN Se0/0/0:23 Q921: Net TX -> RRf sapi=0 tei=0 nr=48

3825-1(config-controller)#shut

3825-1(config-controller)#

*Jan 23 16:40:38.243: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to administratively down

*Jan 23 16:40:38.247: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0/0:23, TEI 0 changed to down

*Jan 23 16:40:40.243: %LINK-3-UPDOWN: Interface Serial0/0/0:23, changed state to down

3825-1(config-controller)#

3825-1(config-controller)#no shut

3825-1(config-controller)#exit

3825-1(config)#exit

3825-1#

*Jan 23 16:41:06.719: %SYS-5-CONFIG_I: Configured from console by girardj on console

*Jan 23 16:41:09.955: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to up

*Jan 23 16:41:09.955: ISDN Se0/0/0:23 Q921: L2_EstablishDataLink: sending SABME

*Jan 23 16:41:09.955: ISDN Se0/0/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0

*Jan 23 16:41:10.955: ISDN Se0/0/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0

*Jan 23 16:41:10.959: ISDN Se0/0/0:23 Q921: Net RX <- UAf sapi=0 tei=0

*Jan 23 16:41:10.959: %ISDN-6-LAYER2UP: Layer 2 for Interface Se0/0/0:23, TEI 0 changed to up

*Jan 23 16:41:11.955: %LINK-3-UPDOWN: Interface Serial0/0/0:23, changed state to up

*Jan 23 16:41:21.067: ISDN Se0/0/0:23 Q921: Net RX <- RRp sapi=0 tei=0 nr=0

*Jan 23 16:41:21.067: ISDN Se0/0/0:23 Q921: Net TX -> RRf sapi=0 tei=0 nr=0

*Jan 23 16:41:31.131: ISDN Se0/0/0:23 Q921: Net RX <- RRp sapi=0 tei=0 nr=0

*Jan 23 16:41:31.131: ISDN Se0/0/0:23 Q921: Net TX -> RRf sapi=0 tei=0 nr=0

3825-1#no debug all

Port Statistics for unclassified packets is not turned on.