Is this set up correct for a remote G450 with 90 digital phones? 2

[OCsurfer]

I have a remote site and there are 90 digital phones that will need to be connected to a G450. The calls will be mainly for Outbound calls via the central CM SIP trunks. A few questions, do I need DSP boards in the G450?

Specs for remote site
Number of G450?
One analog card for 1 911 phone
four 24 port MM717
DSP cards?
Central CM is 6.3

 

[avayaguy23]

You are using digital phones. You need DSP's.

 

[OCsurfer]

What is the formula to calculate the number of needed DSPs?

 

[kyle555]

They usually ship with a MP160 DSP board now and always with a MP80 back in the day. I don't think you can order them without DSPs inside unless you're getting repair stock for a dead motherboard or something.

 

[OCsurfer]

One DSP board will suffice to handle 90 digital phone?

 

[Wanebo]

An MP160 has 160 DSP's and an MP80 has 80. Either one should suffice for 90 phones.

The rule of thumb for DSP requirements is 1 DSP is required to convert each TDM based signal to an IP based signal. You have 90 TDM digital phones and each one with an active conversation being routed to your CM would require a DSP. It's unlikely you would have all 90 sets in calls at any one time so you should be pretty safe even with the MP80.

 

[Sean655]

Each channel on an MP board supports a single call. As Kyle stated, if you're buying a new gateway it should ship with an MP160 and that should have you covered.

 

[OCsurfer]

Thank you all for your input. Happy Friday!

-edit- do I need a LSP? If so, a LSP will need a dedicated trunk for it to work?

 

[kyle555]

An LSP would let whatever's on that gateway keep working when the WAN dies. You said central SIP trunks, so yeah, you'd need a trunk.

What happens when the WAN goes out over there?
If it's the kind of place where people might need to call 911 like a school, then yeah, you need a LSP and a MM711 for a failover analog trunk.
If it's the kind of place where people can't really use their computers anymore and can't get anything done so they just go home or can use their cell phone, you can probably get away without a LSP.

 

[OCsurfer]

Yes it's kind of a disaster recovery site hence the digital phones and analog lines requirements. Is the MGC list where you program the G450 to utilize its trunk in case of a failover scenario?
Thank you Kyle.

 

[Sean655]

MGC stands for media gateway controller, which are the CMs that the gateway would register to. You should be able to find an Avaya guide on setting up programming on a G450 that would answer a lot of questions about the programming needed to set that thing up.

 

[kyle555]

What Sean said. The LSP gets a fully copy of translations from the main CM. The MGC list tells the gateway when to give up on being controlled by the main CM and to start trying the LSP. The recovery rules in the main CM tell the gateway when it should failback.