Hi,

we are trying to design a recording solution using Avaya DMCC Multiple Registration method. For DSP resource sizing, we need some guidance.

I need help to understand, whether the DSP resource will be utilized when there is an actual call going on the IP phone (or) even when the IP phone is not on call.

Note: Recorder can work in Dependent as well as in Independent mode.

Thanks
Karthi Devaraj

The DSP resource is allocated only during an active call.

Hi John

Thanks for your prompt response. Irrespective of the recorder working in Dependent or Independent mode with MR, the DSP resource will be used only during an active call for recording purpose. Is this correct?

Thanks
Karthi Devaraj

correct. A DSP (VoIP resource) is only allocated when media is flowing.

Dependent and Independent concepts are there to handle the presence (registered state) of the Main device (or not). If the Main device is registered, then a Dependent device can successfully register. When the Main device is unregistered, a dependent device is automatically unregistered. An Independent device can register and unregister regardless (independently) of the registration state of the Main device.

Thanks John. It’s very clear now.

Hi John

Kindly suggest how many DSP resources to be used for DMCC based recording in MR as well as in SO methods. We have only 1 recorder used for recording. No redundancy or HA planned for recorders.

We have also initiated beep warning tone from CM side.

Thanks
Karthi

The same amount of DSP capacity is consumed for a station is consumed by a recorder.

MR, SO and SSC recording each takes the same amount of DSP capacity.

Warning tone makes no impact on DSP consumption.

A recorder can be in silent mode - listen only (typical) or bidirectional talk/listen mode. A listen only recorder takes fewer TIMESLOT resources which impacts the total recording capacity of a G4xx or G650 series gateway. Silent mode does not impact the number of DSPs consumed on physical gateways.

I would have to research these answers for Avaya Media Server. If you need that information please open a technical support ticket.

Thanks John.

So, if physical station is consuming 1 DSP resource for a call, the recorder will also consume same 1 DSP resource for recording while using G650/450 gateways on Avaya side.

I was told in some cases, the recorder consumes 2 DSP resources while the physical station while on call consumes only 1 DSP. Any configurations which we need to check?

Thanks
Karthi

Absolute DSP resource (MIPS) consumption is a function of the complexity of the encoding algorithm. G.711 being the least intensive, and codecs such as G.729, G.722, etc. have higher DSP MIPS consumption (they are all not the same). In this day and age a single DSP CPU can handle multiple media streams simultaneously we tend to talk about this topic as a logical entity. Unfortunately, sometimes you wind up with a fragmented DSP that has available MIPS but not enough to use for a full media stream. This makes this topic progressively more complex.

What is the bottom line concern here?