12-29-2011 10:35 AM - edited 03-16-2019 08:45 AM
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
Solved! Go to Solution.
12-29-2011 02:30 PM
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
12-29-2011 11:25 AM
First of all you need to use transcoders not MTPs, each call will use 2 transcoding sessions, so 2 PVDM channels.
HTH,
Chris
12-29-2011 01:17 PM
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
11-18-2014 04:27 AM
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
12-29-2011 01:21 PM
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
12-29-2011 01:27 PM
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
12-29-2011 02:30 PM
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
02-23-2012 11:27 AM
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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