Problem Adding DSP's to 2811 router

[davidme]

I'm at a customers site and I've just added a PVDM2-16 to the existing PVDM2-32. I then changed the pri-groups from an initial 16 channels of E1 to 31.

Now when I dial in from externally, I'm not getting a ringtone just about 10 seconds of buzzing before the call plays fast busy. You can see the call is connected on the gateway but that's about it.

I'm running CCM 4.2(3).

Any ideas? It's a bog standard config that I regularly use.

Cheers - Dave

[fred.s.mollenkopf]

If using MGCP backhaul, then make sure you didn't lose the necessary configuration when you changed your group. Changing the pri-group requires you to shut the voice-port and removes the old pri-group. When re-adding the pri-group, again if MGCP, make sure this is referenced in the configuration. Can you post the config so we can get a better idea of what you are doing?

Please rate any helpful posts

Thanks

Fred

[davidme]

Hi Fred,

I'm using H323. Here's most of the config.

clock timezone GMT 0

clock summer-time BST recurring

network-clock-participate wic 0

network-clock-select 1 E1 0/0/0

!

ip cef

!

voice-card 0

no dspfarm

!

!

voice service voip

h323

h245 caps mode restricted

!

!

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

!

!

voice class h323 1

h225 timeout tcp establish 3

!

!

controller E1 0/0/0

pri-group timeslots 1-16

description ## xxxx ##

!

!

interface Loopback0

ip address 192.168.10.1 255.255.255.255

!

interface FastEthernet0/0

description ## Connection to Core Switch 7/48 ##

ip address 10.x.x.x x.x.x.x

duplex full

speed 100

h323-gateway voip bind srcaddr 10.17.10.1

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/0/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

!

!

ip route 0.0.0.0 0.0.0.0 x.x.x.x

!

ip http server

ip http authentication local

no ip http secure-server

ip http timeout-policy idle 60 life 86400 requests 10000

!

control-plane

!

!

voice-port 0/0/0:15

cptone GB

Cheers

Dave

[d-roush]

Like Fred said, changing the pri-group requires you to shut the voice-port which removes it from the dial-peer. Check to see if your voice-port is associated with your dial peers.

[fred.s.mollenkopf]

David,

Good suggestion but that shouldn't affect him for external inbound calls unless the dial-peers were physically removed as well. Port statements are only used for outbound dial-peer selection. Definitely would cause a problem if outbound calls from the gateway were the issue.

Thanks

Fred

[fred.s.mollenkopf]

David,

Actually I'm wrong, port is a valid option in inbound selection. Don't know what I was thinking when writing that last post. Here is the inbound matching document. Long day I guess.

http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml

Thanks

Fred

[fred.s.mollenkopf]

Hahaha, read a little further and we are both right. It can match on Port but isn't required. If it doesn't match on port or any other dial-peer based off dial-peer selection criteria (incoming called-number, etc.) then it matches on the default dial-peer. I thought that Port wasn't required for inbound but I started to second guess myself, again long day.

Thanks

Fred

[fred.s.mollenkopf · Accepted solution]

Dave,

You want to run these commands to help diagnose this.

Sh isdn status

Sh isdn service

Sh voice dsp detailed

Make sure that the new DSP is showing up. You should see a total of 3 DSPs now. Verify after the change that all of the channels are in an Idle state (if not check with Telco and verify their change). I'm thinking the channels are in a bottom up selection from Telco, you increased the channels but either those new channels aren't working or the DSP is not working for the new channels and the calls are coming in on 31. Main thing is you want to verify the channels and the DSPs state. If everything looks well in the sh voice dsp detailed then run the DSP test via the hidden command. Here is the link.

http://www.cisco.com/en/US/products/hw/modules/ps2617/products_tech_note09186a008039c316.shtml#s3

Please rate any helpful posts

Thanks

Fred