IOS conference bridge issue

[rynard.coetzee]

Hi all

I have an issue on an IOS CFB where it only allows 4 participants in a conference ,when you try and dial the 5th participant into the conference it just gives a fastbusy tone. When checking on the router i can see there are DSP slots available

sh dspfarm dsp all
SLOT   DSP VERSION  STATUS CHNL USE   TYPE    RSC_ID BRIDGE_ID PKTS_TXED PKTS_RXED

0      1   37.2.0   UP     N/A  FREE  xcode   1      -         -         -
0      1   37.2.0   UP     N/A  FREE  xcode   1      -         -         -
0      1   37.2.0   UP     N/A  FREE  xcode   1      -         -         -
0      1   37.2.0   UP     N/A  FREE  xcode   1      -         -         -
0      1   37.2.0   UP     N/A  FREE  xcode   1      -         -         -
0      1   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      1   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      1   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      2   37.2.0   UP     1    USED  conf    2      8917360   12756     12755
0      2   37.2.0   UP     1    USED  conf    2      8917361   12753     12753
0      2   37.2.0   UP     1    USED  conf    2      8917455   11162     11143
0      2   37.2.0   UP     1    USED  conf    2      8917456   1202      1193
0      2   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      2   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      2   37.2.0   UP     N/A  FREE  conf    2      -         -         -
0      2   37.2.0   UP     N/A  FREE  conf    2      -         -         -

Total number of DSPFARM DSP channel(s) 13

Any ideas ?

[Jaime Valencia]

I'll assume this is working with CUCM, what are the CFB related parameters set to??

The default is 4 participants.

[rynard.coetzee]

Hi Guys

Thanks for the replies ,the service param in CUCM is set to 8. Here is the relevant GW config :

sccp local GigabitEthernet0/1.1121
sccp ccm 172.21.253.54 identifier 2 version 6.0
sccp ccm 172.21.253.55 identifier 1 version 6.0
sccp ccm 172.21.253.41 identifier 7 version 7.0
sccp

sccp ccm group 1
 bind interface Loopback0
 associate ccm 1 priority 1
 associate ccm 2 priority 2
 associate profile 1 register g711u_vpn1_mtb
 associate profile 2 register g711a_vpn1_mtb
 associate profile 3 register g729_vpn1_mtb
 associate profile 4 register xcode_vpn1_mtb
 associate profile 5 register conf_vpn1_mtb
 switchover method immediate
 switchback method immediate

dspfarm profile 5 conference
codec g729br8
codec g729r8
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
maximum sessions 8
associate application SCCP

So according to the default on the dspfarm and what is set in CUCM service param i should be able to have 8 participants in a conference ,i have checked the CUCM traces but was unable to pick up anything significant from there ,also did a debug sccp errors on GW ,but did not pick up anything obvious there either.

[Chris Deren]

Post full GW config and as Jamie suggested check value of "Maximum Ad Hoc Conference" service parameter which defaults to 4, and would explain your issue. You can change it there to desired limit, that matches your participant limit on dspfarm profile (default is 8).

[Mohammed al Baqari]

Hi,

Can you please share the output of 'show dspf pro 5' and 'sh sccp'

During active conference, can you share the output of 'sh voice dsp capabilities slot x' and 'sh voice dsp group all'.