SIP trunking and DSP resources on UC500 systems

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Mar 28th, 2013
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Hi All.


I've come up with some questions and can't find the proper answers for them. I'm wondering if somebody can help me with answers.

1) How can I check how many simultaneous calls can UC500 handle through SIP trunk? How many users can be on the calls at the same time (DDi range is 10 numbers for example)?

  I configured UC520 (UC520-16U-K9) for SIP trunk and conferencing, see below:

!

dspfarm profile 2 transcode

description CCA transcoding for SIP Trunk

codec g729abr8

codec g729ar8

codec g711ulaw

maximum sessions 2

associate application SCCP

!

dspfarm profile 1 conference

description DO NOT MODIFY, active CCA conference profile - CCA2.0 codec711

codec g711alaw

codec g711ulaw

maximum conference-participants 16

maximum sessions 2

associate application SCCP

!

For conferencing I can see that max participants only 16. But for SIP trunk only max sessions 2. Does it mean that only 2 calls (can't increase that) can be made simultaneously?

Below is show DSP:

uc520#sh dspfarm all

Dspfarm Profile Configuration


Profile ID = 2, Service = TRANSCODING, Resource ID = 1

Profile Description : CCA transcoding for SIP Trunk

Profile Service Mode : Non Secure

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: num_of_codecs:3

Codec : g729abr8, Maximum Packetization Period : 60

Codec : g729ar8, Maximum Packetization Period : 60

Codec : g711ulaw, Maximum Packetization Period : 30

Dspfarm Profile Configuration


Profile ID = 1, Service = CONFERENCING, Resource ID = 2

Profile Description : DO NOT MODIFY, active CCA conference profile - CCA2.0 codec711

Profile Service Mode : Non Secure

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

Maximum conference participants : 16

Codec Configuration: num_of_codecs:2

Codec : g711alaw, Maximum Packetization Period : 30 , Transcoder: Not Required

Codec : g711ulaw, Maximum Packetization Period : 30 , Transcoder: Not Required



SLOT DSP VERSION  STATUS CHNL USE   TYPE    RSC_ID BRIDGE_ID PKTS_TXED PKTS_RXED


0    1   28.3.8   UP     N/A  FREE  xcode   1      -         -         -

0    1   28.3.8   UP     N/A  FREE  xcode   1      -         -         -

0    2   28.3.8   UP     N/A  FREE  conf    2      -         -         -

0    2   28.3.8   UP     N/A  FREE  conf    2      -         -         -


Total number of DSPFARM DSP channel(s) 4


2) How can I check the same stuff on UC540 and UC560? Once I configure SIP trunk on them I need to know how many calls (in/out) can be made simultaneously through SIP trunk?


3) If analog fax is connected to UC500, does it use DSP resources when sending/receiving faxes on SIP trunk?


Thanks in advance.

Regards,

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firestormnet Thu, 03/28/2013 - 07:25
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I think I've got an answer: there are only limitations by bandwith and SIP provider (if any).

danplacek Thu, 03/28/2013 - 09:12
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Codec also matters. If you have to do transcoding from G729 to G711 there will be limits (depends on what you have setup for conferencing too).


-Dan


Please rate useful posts.

firestormnet Mon, 04/08/2013 - 05:16
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Dan, yes, the transcoding matters as well.

Actually when you configure SIP Trunk using CCA, it gives you "Maximum Number of calls". For example on UC560 there is an option (1-48) to choose from.

Christian Semmler Wed, 04/10/2013 - 06:13
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Hi,

for the SIP trunks there are no limits from the system. Check this out: https://supportforums.cisco.com/message/3795863#3795863


If you have different voice codecs for your phones and the trunk you need DSP ressources for transcoding.

As I know the UC520 have a PVDM2-64 with 4 DSP chips. You can use the DSP calculator from cisco to find out how many DSPs you need. But keep in mind that conferencing and transcoding can't share a DSP processor.

For example 1 DSP for conferencing and 3 for transcoding.


best regards

Christian

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