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How many voice calls can be handled by voice gateway PRI

Roger B
Level 1
Level 1

‎04-17-2013 03:35 AM - edited ‎03-16-2019 04:51 PM

Hello,

I am having 2800 series router equipped with two PVDM2-64 cards and two different PRIs are working. Now i want to know how many simultaneous calls (Incoming & Outgoing) can be handled, if both PRI's are active. Router's image feature set is SPSERVICESK9-M and version is "124-24.T4.bin"

Thanks in advance!!!!!!!!!

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15 Replies 15

Aman Soi
VIP Alumni
VIP Alumni

‎04-17-2013 03:44 AM

Hi Rahul,

You can have 30 voice channels simultaneously active on one E1 PRI.

In your case,it would be 60.

regds,

aman

Ayodeji Okanlawon
VIP Alumni
VIP Alumni

‎04-17-2013 03:58 AM

Rahul,

This all depends on what your dsp codec complexity mode is set to. If you use the default flex mode then PVDM2-64 will support 64 voice  channels for both inbound and outbound however if your dsp complexity is set to high, then you will have half of that available..Ie 32 channels.

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Roger B
Level 1
Level 1
In response to Ayodeji Okanlawon

‎04-17-2013 04:00 AM

Hi,

Thanks for reply. Can you please guide on ow to check the existing dsp codec complexity mode on router?

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Ayodeji Okanlawon
VIP Alumni
VIP Alumni
In response to Roger B

‎04-17-2013 04:08 AM

You can use this command,

show voice dsp group all

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Roger B
Level 1
Level 1
In response to Ayodeji Okanlawon

‎04-17-2013 04:17 AM

Hi,

Thanks. Just wanted to know what is the default complexity mode on router , as i am not seeing anything configured related to complexity under voice-card.

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Ayodeji Okanlawon
VIP Alumni
VIP Alumni
In response to Roger B

‎04-17-2013 04:36 AM

Then its using the default complexity which is flex mode...You can confirm this by using the command I posted above...post the output

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Aman Soi
VIP Alumni
VIP Alumni
In response to Roger B

‎04-17-2013 04:37 AM

Hi Rahul,


It depends on Harwdare module which we are using which is configurable through IOS.

HardwareDefault Complexity
NM-HDVMedium
NM-HDAMedium
AIM-VOICEMedium
NM-HD-1V/2V/2VEFlex
NM-HDV2, NM-HDV2-1T1/E1, and NM-HDV2-2T1/E1Flex
Cisco IAD2430 Integrated access deviceFlex



regds,

aman

Roger B
Level 1
Level 1
In response to Aman Soi

‎04-18-2013 09:52 AM

Hi,

Please find the asked output ...

Router# show voice dsp group all

DSP groups on slot 0:

dsp 1:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 16

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 150, reserved credits: 0

    Signaling channels allocated: 16

    Voice channels allocated: 6

    Credits used: 90

    Voice channels:

      Ch01: voice port: 0/0/0:15.31, codec: g711ulaw, credits allocated: 15

      Ch02: voice port: 0/0/0:15.30, codec: g711ulaw, credits allocated: 15

      Ch03: voice port: 0/0/0:15.29, codec: g711ulaw, credits allocated: 15

      Ch04: voice port: 0/0/0:15.28, codec: g711ulaw, credits allocated: 15

      Ch05: voice port: 0/0/0:15.26, codec: g711ulaw, credits allocated: 15

      Ch06: voice port: 0/0/0:15.27, codec: g711ulaw, credits allocated: 15

dsp 2:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 16

  Transcoding channels allocated: 1

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 180, reserved credits: 0

    Signaling channels allocated: 14

    Voice channels allocated: 2

    Credits used: 30

    Voice channels:

      Ch02: voice port: 0/3/0:15.31, codec: g711ulaw, credits allocated: 15

      Ch03: voice port: 0/0/0:15.24, codec: g711ulaw, credits allocated: 15

  Group: FLEX_GROUP_XCODE, complexity: MEDIUM

    Shared credits: 0, reserved credits: 30

    Transcoding channels allocated: 0

    Credits used: 0

dsp 3:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 16

  Transcoding channels allocated: 7

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 30, reserved credits: 0

    Signaling channels allocated: 2

    Voice channels allocated: 0

    Credits used: 0

  Group: FLEX_GROUP_XCODE, complexity: MEDIUM

    Shared credits: 0, reserved credits: 210

    Transcoding channels allocated: 0

    Credits used: 0

dsp 4:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 16

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 240, reserved credits: 0

    Signaling channels allocated: 16

    Voice channels allocated: 0

    Credits used: 0

dsp 5:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 12

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 240, reserved credits: 0

    Signaling channels allocated: 12

    Voice channels allocated: 0

    Credits used: 0

dsp 6:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 0

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 240, reserved credits: 0

    Signaling channels allocated: 0

    Voice channels allocated: 0

    Credits used: 0

dsp 7:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 0

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_VOICE, complexity: FLEX

    Shared credits: 240, reserved credits: 0

    Signaling channels allocated: 0

    Voice channels allocated: 0

    Credits used: 0

dsp 8:

  State: UP, firmware: 24.3.4

  Max signal/voice channel: 16/16

  Max credits: 240

  num_of_sig_chnls_allocated: 0

  Transcoding channels allocated: 0

  Group: FLEX_GROUP_CONF, complexity: CONFERENCE

    Shared credits: 0, reserved credits: 240

    Codec: CONF_G729, maximum participants: 8

    Sessions per dsp: 2

DSP groups on slot 1:

This command is not applicable to slot 1

DSP groups on slot 2:

This command is not applicable to slot 2

  0 DSP resource allocation failure

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Aman Soi
VIP Alumni
VIP Alumni
In response to Roger B

‎04-18-2013 10:00 AM

Hi Rahul,

It is showing FLEX.

regds,

aman

Roger B
Level 1
Level 1
In response to Aman Soi

‎04-18-2013 10:12 AM

hi,

Ok. it means it will support of 60 simultaneous calls (incoming & outgoing)right?..if yes how can we check these 60 calls on PRI?.. means do i need to dial 60 different numbers?

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Aman Soi
VIP Alumni
VIP Alumni
In response to Roger B

‎04-18-2013 10:40 AM

Hi ,

U can check through show isdn calls active  can give u the status of active calls whether Incoming or outgoing.

You would be having a Pilot number provided by Service Provider and DID if provided.

u can check by making isdn test call interface s0/0/0:1 987853211[PSTN number]

isdn test call interface s0/0/0:2 76241033[Landline number]

regds,

aman

Roger B
Level 1
Level 1
In response to Aman Soi

‎04-20-2013 08:52 AM

Hi,

If both PRI are member of MRGL for transcoding & conferencing then what will be the number of total calls supported by those PRI?

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Ayodeji Okanlawon
VIP Alumni
VIP Alumni
In response to Roger B

‎04-20-2013 10:20 AM

8

Rahul..You need to understanding how resources are allocated on dsps. This is done via credits allocation. Each dsp has a maximum pof credits it can support and based on the configured voice channels, transcoding or conference resources as well as the codec complexity, the total number of voice/xcoding/conference channels are determined..

Please refer to this documents...

https://supportforums.cisco.com/docs/DOC-29164

https://supportforums.cisco.com/docs/DOC-29151

Based on the output of the command you provided..

You have 8 dsps...Each dsp has a total of 240 credit...

DSP 1 has a total 16 channels used..hence this dsp has no free credit available

DSP2 has a total of 14 channels configured for voice (14*15=210 credits) and 1 channel for xcoding (using 30 credit) making a total of 240 credits...Hence this dsp has no free credit available

DSP3 has 7 channels for xcoding ( a total of 30*7=210 credits) and 2 voice channels...hence no credit available

DSP4  has 16 channels allocated..hence no credits available

DSP5 has only 12 channels (15*12=180 credits) hence you hvae 60 free credits here...( which is 4 voice channels or 2 xcoding channels)

DSP6 has 240 free credits....which is 16 voice channels

DSP 7 also has 240 credits free

DSP 8 is reserved for conferencing and supports 2 sessions..

So in summary you have configured...60 PRI channels, 8 medium complexity xcoding channels and 2 g729 conference sessions...

You have available a total of 540 credits...which can support 540/15= 36 voice channels...This will be equivalent to 1 additional E1 PRI

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

Please rate all useful posts

Roger B
Level 1
Level 1
In response to Ayodeji Okanlawon

‎04-23-2013 01:16 AM

Hi,

Thank you very much for these links.

can you please confirm what will be the normal CPU usage if 12-15 calls are unning on PRI. I am getting 70% usage once or twice.

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