Transcoder Won't Register

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Jul 14th, 2009
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I am trying to register a Transcoder using old PVDM-12's on a 2821 running IVS_M 12.4.20(T2)

From all the docs it seems to be configured right, but not go. I have a TAC open as well, but that is just lingering.

Using CUCM 7.0.1, I have a Cisco IOS Media Termination Point Hardware device using the MAC of my router.

In the router:

voice-card 1 (this is the right slot)


dsp services dspfarm

sccp local GigabitEthernet0/0


sccp ccm priority 1

sccp ccm priority 2


dspfarm transcoder maximum sessions 24


These are my errors:

vgw1#sh dspfarm

DSPFARM Configuration Information:

Admin State: UP, Oper Status: ACTIVE_IN_PROGRESS - Cause code: ADMIN_STATE_UP

Transcoding Sessions: 24(Avail: 24), Conferencing Sessions: 0 (Avail: 0)

Trans sessions for mixed-mode conf: 0 (Avail: 0), RTP Timeout: 600

Connection check interval 600 Codec G729 VAD: ENABLED

vgw1#sh sccp

SCCP Admin State: UP

Gateway IP Address:

Switchover Method: IMMEDIATE, Switchback Method: GUARD_TIMER

Switchback Guard Timer: 1200 sec, IP Precedence: 5

Max Supported MTP sessions: 0

User Masked Codec list: None

Transcoding Oper State: DOWN - Cause Code: DSPFARM_DOWN

Active Call Manager: NONE


Conferencing Oper State: DOWN - Cause Code: DSPFARM_DOWN

Active Call Manager: NONE


Call Manager:, Port Number: 2000

Priority: 1, Version: 3.1 or Higher

Call Manager:, Port Number: 2000

Priority: 2, Version: 3.1 or Higher

Any input would be appreciated.

Thanks in advance

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testeven Tue, 07/14/2009 - 09:03
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Have you tried to so a no sccp/sccp from the router? If you think the config is right, you can try to reload the router too.

However, you need to check too how did you add the CFB or transcoder on the CUCM Admin page. Please refer to the following link for

troubleshooting DSP registration:

If all the config is correct I would try to delete the transcoder from the CUCM admin page and add it again as per the following document:

Hope this helps! If it does, please rate :)


e.huntley Tue, 07/14/2009 - 09:09
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Outside of restarting CUCM, I have done almost everything. The only thing that is a little shaky is that it won't let me delete the transcoder commands in the router. It says to take the DSPFARM down first, but then when you try it, it says DSPFARM is still coming up or something like that. So you can say no dspfarm, and no sccp, but it never lets you remove the settings.

testeven Tue, 07/14/2009 - 09:44
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Is this the document you followed?

Make sure you are not sharing DSPs... sometimes you are not able to shut the DSP profile if for example all the DSP resources are

being tied up on a PRI on the T1 controller. Do not share DSP resources. Make sure that each DSP profile is configured with

resouces from one media card and that you added the XCODER using the MTP on the CCM Admin page.

Hope this helps! If it does, please rate :)



martin1.plank Tue, 07/14/2009 - 09:35
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sccp local GigabitEthernet0/0

sccp ccm identifier 1 priority 1

sccp ccm identifier 2 priority 2



sccp ccm group 1

bind interface GigabitEthernet0/0

associate ccm 1 priority 1

associate ccm 2 priority 2

associate profile 1 register MTP999000000001


dspfarm profile 1 transcode

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

codec g729r8

codec g729br8

maximum sessions 24

associate application SCCP

On the CUCM zu use MTP999000000001 for MAC-Adress of the Transcoder

Nicholas Matthews Tue, 07/14/2009 - 11:59
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This looks correct to me.

I would check 'show voice dsp group all' and 'show voice dsp detail' to make sure the DSPs are in a good state.

Next, I would start unconfiguring/reconfiguring, and restarting things.


testeven Tue, 07/14/2009 - 12:08
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Yeah, check DSP Hardware, probably they are bad and need replacement.


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