[cisco-voip] Transcoding Problems - 2821 router with PVDM2-48

[Jason Evans]

I am trying to configure my 2821's at remote sites (with a PVDM2-48 DSP
card) so that they can transcode b/w g711 and g729, thereby giving users
across the WAN the ability to use ad-hoc/meet-me conferencing. I have
configured the 2821 with the following:

 

IOS version is 12.3(8r)T7

 

voice-card 0

 dspfarm

 dsp services dspfarm

!

sccp local GigabitEthernet0/1

sccp ccm 172.21.1.22 identifier 3 version 4.0

sccp ccm 172.21.1.21 identifier 2 version 4.0

sccp ccm 172.21.1.20 identifier 1 version 4.0

sccp ip precedence 1

sccp

!

sccp ccm group 1

 description NY Primary CM

 bind interface GigabitEthernet0/1

 associate ccm 3 priority 3

 associate ccm 2 priority 2

 associate ccm 1 priority 1

 associate profile 1 register DC-TRANS

!

dspfarm profile 1 transcode

 description transcoding for ad-hoc conf calls

 codec g711ulaw

 codec g711alaw

 codec g729ar8

 codec g729abr8

 codec gsmfr

 maximum sessions 2

 associate application SCCP

 

I have also followed the instructions here
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administra
tion_guide_chapter09186a00801ec5bf.html#42346 ... for configuring CM
with media resource and transcoder resource. 

 

The IOS GW at the remote site is registered with CM as an IOS MTP and
assigned to the proper device pool. I can see that the status is
"Associated." Also, the Media Resource Group on CM has this transcoding
resource added and the List is assigned to the device pool. Everything
here looks good. 

 

Show dspfarm all produces:

 

---------------------------------------------

Dspfarm Profile Configuration

 

 Profile ID = 1, Service = TRANSCODING, Resource ID = 1

 Profile Description : transcoding for ad-hoc conf calls

 Profile Admin State : UP

 Profile Operation State : ACTIVE

 Application : SCCP   Status : ASSOCIATED

 Resource Provider : FLEX_DSPRM   Status : UP

 Number of Resource Configured : 2

 Number of Resource Available : 2

 Codec Configuration

 Codec : g711ulaw, Maximum Packetization Period : 30

 Codec : g711alaw, Maximum Packetization Period : 30

 Codec : g729ar8, Maximum Packetization Period : 60

 Codec : g729abr8, Maximum Packetization Period : 60

 Codec : gsmfr, Maximum Packetization Period : 20

 

 

SLOT DSP VERSION  STATUS CHNL USE   TYPE   RSC_ID BRIDGE_ID PKTS_TXED
PKTS_RXED

 

0    2   4.4.6    UP     N/A  FREE  xcode  1      -         -         -

0    2   4.4.6    UP     N/A  FREE  xcode  1      -         -         -

 

Total number of DSPFARM DSP channel(s) 2

----------------------------------------------------------------------

 

However, when I place a call from the remote site to a phone in NY,
press conference to bring in another phone in NY and join, I get a fast
busy on the remote phone while the 2 NY phones join the conference
resource fine. 

 

There is no activity on the remote IOS GW as I'm debugging SCCP and DSP.
Also looking through the CM traces, it never tries or queries the remote
router for its DSP resources - it just says 

 

04/17/2006 18:55:39.556 CCM|MRM::waiting_AllocateMtpResourceErr - ERROR
- no resources are available -- ci =

 

What am I missing here? Does the DSP resource have to be in the same
location as the CM Cluster? Why is CM not even trying to use the
resources I have allocated if everything is registered properly?

 

Thanks in advance!

 

Jason

 

 

 

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