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Central recording server using MTP at remote

MARK BAKER
Level 4
Level 4

I am getting ready to implement a voice recording solution. We will be using auto recording / RTP forking. We will have centralized recording servers and wish to transcode the G.711 recording streams to G.729 using MTP on the remote site voice gateways. I am trying to calculate the required DSPs for this solution. I can see our current MTP max sessions when I configure the MTP, but I don't know if this equates to a 1 for 1 for recording sessions. There will be two recording streams in the same direction, remote to HQ this includes the agent and customer streams. Does anyone know how many MTP sessions are used per recording session?

I would assume it would be 1 MTP session per normal bi-directional call, but not sure with both streams going in the same direction for the recording sessions.

Thanks,

Mark

1 Accepted Solution

Accepted Solutions

Mark,

So, with PRI/T1 2 port FXS and 2 port E&M cards, not sure if you have conference bridge defined you don't have that much PVDM channels left. Your only option would be to define only 6 sessions xcoder or add extra PVDMs.  It is what it is no way around it if you need to transcode calls, otherwise if you have sufficient bandwidth run them across WAN as G711. it is always a tradeoff between bandwidth or PVMDs, PVMDs in most cases are cheaper from monthly bandwidth charges.

HTH,

Chris

View solution in original post

7 Replies 7

Chris Deren
Hall of Fame
Hall of Fame

First of all you need to use transcoders not MTPs, each call will use 2 transcoding sessions, so 2 PVDM channels.

HTH,

Chris

Chris,

That's right, transcoders not MTPs. That's unfortunate. I can only get about a 1/3 transcoders as MTPs. It's also unfortunate that a recording call takes up two sessions. I don't understand why the system can't be configured to multiplex the recording stream into one stream and use a codec that is different than the original call. This can be done for monitoring but not recording.

Just to be clear. When I configure a transcoder and then enter "max sessions ?", it shows 1-7 as options. So, the most full recording sessions I can get out of this voice router is 3?

Thanks,

Mark

Hi Mark,

 

We have a similiar issue with transcoders and the ip address being 0.0.0.0 , did you manage to fix this?

 

thanks

mark

Chris Deren
Hall of Fame
Hall of Fame

what codecs do you have listed under your xcoder profile? Can you post your config and "show inventory"?

Sent from Cisco Technical Support iPhone App

I have g711ulaw and g729r8 configured. There is a mix of 2811 and 2911 voice routers. This is a typical config.

Show inventory:

NAME: "CISCO2911/K9 chassis", DESCR: "CISCO2911/K9 chassis"
PID: CISCO2911/K9      , VID: V02 , SN: FTX1533AN65

NAME: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0 SubSlot 0", DESCR: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1"

PID: VWIC2-1MFT-T1/E1  , VID: V01 , SN: FOC15240VK1

NAME: "3rd generation two port FXS DID voice interface daughtercard on Slot 0 SubSlot 1", DESCR: "3rd generation two port FXS DID voice interface daughtercard"
PID: VIC3-2FXS/DID     , VID: V03 , SN: FOC15273DM3

NAME: "3rd generation two port EM voice interface daughtercard on Slot 0 SubSlot 2", DESCR: "3rd generation two port EM voice interface daughtercard"

PID: VIC3-2E/M         , VID: V02 , SN: FOC15297W3H

NAME: "PVDM3 DSP DIMM with 64 Channels on Slot 0 SubSlot 4", DESCR: "PVDM3 DSP DIMM with 64 Channels"
PID: PVDM3-64          , VID: V01 , SN: FOC153013MW

NAME: "C2911 AC Power Supply", DESCR: "C2911 AC Power Supply"
PID: PWR-2911-AC       , VID: V03 , SN: DCA1522R1GX

Thanks,
Mark

Mark,

So, with PRI/T1 2 port FXS and 2 port E&M cards, not sure if you have conference bridge defined you don't have that much PVDM channels left. Your only option would be to define only 6 sessions xcoder or add extra PVDMs.  It is what it is no way around it if you need to transcode calls, otherwise if you have sufficient bandwidth run them across WAN as G711. it is always a tradeoff between bandwidth or PVMDs, PVMDs in most cases are cheaper from monthly bandwidth charges.

HTH,

Chris

Chris,

You were a big help on this before. I am hoping you can help me out again.

I have our recording system installed, but I'm having an issue with the transcoders. I see them allocated and see the traffic from my phone to the transcoder at the interface of the router, but I don't see them making it to the transcoder. Any ideas on this? As you can see a recording transcoding session uses 2 sessions on the transcoder. If it actually worked in this case that is. 192.168.1.88 is my recording server.

router#sho sccp conn
sess_id    conn_id      stype mode     codec   sport rport ripaddr

33560405   33968012     xcode sendonly g729b   17474 59752 192.168.1.88
33560405   33968011     xcode recvonly g711u   17184 0     0.0.0.0
33560406   33968015     xcode sendonly g729b   32214 59753 192.168.1.88
33560406   33968014     xcode recvonly g711u   21316 0     0.0.0.0

Total number of active session(s) 2, and connection(s) 4

Thanks,

Mark

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