Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Cisco/Linksys SPA 2102 second line configuration on same number?

On the SPA 2102, there are two phoneports / lines provided.

Each port is rated at 2 RENs.  What I would like to be able to do is to use both lines for the same VOIP number in order to connect a phone to each line and have them use the same phone number.  Initially I plan to have a Hardwired phone and a cordless phone setup which I could connect to a double socket adaptor.  But later I would like to install several hardwired phones around the house and don't want to overload the device.

Any feedback would be apprecieted.


Re: Cisco/Linksys SPA 2102 second line configuration on same num

I use SPA 2102 in our network. I've thousands of this phone adapters. From data sheet you can see that the Maximum Ringer Load is 3 REN.
A REN, ringer equivalence number, is the number which specifies the electrical ringing load supported from a line.
Only old telephone ringing circuits have a REN of 1. Modern phone equipments may be significantly lower than 1 because they use external power supply, digital ringer, etc. A medium value of REN is 0,1.
So you can configure a single line and connect many phones without problem. You can also configure the same number on both lines but in this way yuo have a busy line only with two concurrent calls.

We have connected up to 5 cordless to a Linksys SPA without problem.