Solved: Questions about DSPs conferences capabilities

j.rodriguez.hormigos · ‎02-18-2010

Hi,

I don´t have enough experience with VoIP and I need your help.

I have a Cisco 3845 voice gateway with version 12.4(20)T2, I have 2 DSP PVDM2-64. This gateway handle 300 phones approximately

The conf for conferences and transcoding is:

dspfarm profile 2 conference
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
codec g729r8
codec g729br8
maximum sessions 2
associate application SCCP

dspfarm profile 1 transcode
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
maximum sessions 9
associate application SCCP

sh dsp dsp all shows:

C5421 1 01 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 1 02 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 1 03 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 1 04 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 2 01 {medium}     23.8.0 IDLE idle      0 0 3/0/0     NA     0          0/0
C5421 2 02 {medium}     23.8.0 IDLE idle      0 0 3/0/1     NA     0          0/0
C5421 2 03 {medium}     23.8.0 IDLE idle      0 0 3/0/2     NA     0          0/0
C5421 2 04 {medium}     23.8.0 IDLE idle      0 0 3/0/3     NA     0          0/0
C5421 3 01 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 3 02 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 3 03 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 3 04 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 4 01 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 4 02 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 4 03 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0
C5421 4 04 {medium}     23.8.0 IDLE idle      0 0 none      NA     0          0/0

Questions:

1. Can I release this allocation, if so how can I proceed?

2. I haven´t have configured MTP, is it necessary?

3. How can I calculate the number of participants per session with this conf? Is it 2 sessions per DSP or 2 session totally?

If you need additional information please let me know.

Many thanks for your help, really appreciated.

Regards.

Jaime Valencia · ‎02-18-2010

Table 6 covers all this

Table 6 Theoretical System Capacities for One DSP

You might have 2xPVDM2-64 but you're using only 1 DSP for CFB, so that's

IF ONLY G711 enabled on dspfarm profile:

8 sessions
(8 x 8 = 64 conferees)

If ONLY G729 or G729 is included in the codec list:

2 sessions
(8 x 2 = 16 conferees)

Number of sessions per DSP depends on codecs enabled.

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

View solution in original post

Jaime Valencia · ‎02-18-2010

1. Decrease the number of sessions

2. Depends, read this:

Media Termination Point (MTP)

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/media.html#wp1046314

3. To learn how to calculate all that read this:

Configuring Enhanced Conferencing and Transcoding for Voice Gateway Routers

http://www.cisco.com/en/US/docs/ios/voice/cminterop/configuration/guide/vc_enh_confr_vgr_ps6441_TSD_Products_Configuration_Guide_Chapter.html

Sessions = 1 CFB with X participants

Number of sessions depend on codecs you enabled, all explained in the above link.

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

j.rodriguez.hormigos · ‎02-18-2010

Hey Java,

Thank you for yor answer,

I follow having a doubt, when you say:

Sessions = 1 CFB with X participants

Number of sessions depend on codecs you enabled.

I don´t undestand very well this part, so in my case I have 2 PVDM-64 and I use G711 and G729.

Cisco says for 4 PVDM2-64:

g711

50 sessions
(400 conferees)

and g729

32 sessions
(256 conferees)

in both cases I get the same result, in my case with 2 sessions = 16 conferees as maximun. Is this correct? I think I don´t know calculate the number of sessions..

Can you help to clarify this point.

Many thanks again for your help Java.

Paul.

Varun Muthusamy · ‎02-18-2010

If it helps you can use this calculator on the cisco website. but you will need a CCO account.

http://www.ciscosystems.com/cgi-bin/Support/DSP/dsp-calc.pl

Regards

Varun

j.rodriguez.hormigos · ‎02-19-2010

Hi Varun,

Thanks for your answer.

Yes I have a CCO account and I know the DSP calculator but my problem was I didn´t undestand some points regarding conferences in Cisco guides.

Tks again.

Paul.

Jaime Valencia · ‎02-18-2010

Table 6 covers all this

Table 6 Theoretical System Capacities for One DSP

You might have 2xPVDM2-64 but you're using only 1 DSP for CFB, so that's

IF ONLY G711 enabled on dspfarm profile:

8 sessions
(8 x 8 = 64 conferees)

If ONLY G729 or G729 is included in the codec list:

2 sessions
(8 x 2 = 16 conferees)

Number of sessions per DSP depends on codecs enabled.

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

j.rodriguez.hormigos · ‎02-18-2010

Hi Java,

Many thanks for your help.

This answer solved my doubt.

Paul.