Local Gateway options for Webex calling

[carl_townshend]

Hi All

I need to install a local gateway for one of our sites using Webex calling, I have some questions.

I want to use a physical router, so I'm looking at a Cisco C8300-1N1S-6t, this will connect to the local telco provider using SIP.

1.Does the gateway need a PVDM, I imagine no more than 20 calls max, if so which PVDM?

2.What licence would I need? do I need a CUBE licence also ?

3.I believe for PSTN calls, Webex will use G711? so no transcoding should be required from Opus to 711?

Many thanks

[b.winter]

1.Does the gateway need a PVDM, I imagine no more than 20 calls max, if so which PVDM? --> If you don't need to do transcoding, you don't need PVDMs

2.What licence would I need? do I need a CUBE licence also ? --> Local Gateway is a CUBE (just a name for "CUBE for Webex"), so yes you need CUBE lics.

3.I believe for PSTN calls, Webex will use G711? so no transcoding should be required from Opus to 711? --> If you switch between OPUS and 711 it's transcoding.

[Jonathan Schulenberg]

2. You need a subscription for DNA Essentials and CUBE. Flex calling enterprise agreements can provide some CUBE licenses for free if the partner ticks the correct box.

3. The main thing to watch for here is a SIP provider that wants to use G.729 which some components of WxC-MT will not accept. IIRC, ad-hoc conferences and Call Queue prompts are examples of this. If the provider won’t guarantee G.711 for all calls you may need some transcoding resources.

[Joe_Tseng1]

Hi Jonathan,

How to calculate the number of CUBE licenses required?

Codecs do not require transcoding, but channels are still needed to carry the codec, right? As shown in the attached image, in a situation where transcoding is not required, a PVDM4-32 can support 32 G.711 channels.

[b.winter]

If a call doesn't need to be transcoded, you don't use any transcoding resource.
CUBE licenses count is the expected simultaneous number of calls. So if you expect max. 100 calls at the same time, you buy 100 licenses.
But there is no "general calculation".

For most of the SIP provides, you also buy channels. E.g. you buy 50 sip channels with your provider. This means, the provider restricts you to max. 50 calls at the time => max. 50 calls is 50 CUBE licenses.

The PVDM has nothing to do with the CUBE license count.
It just provides you the max. amount of calls, the hardware supports for different kinds of transcoded calls.
But again: if you don't need to transcode a call at all (all the call legs are G.711 a-law), no transcoding resource is used.