[cisco-voip] Intercom Broadcasting to all IP phones question.

[Alex Pitzner]

Hello. I have been search for ways to broadcast intercom messages to all
IP phones and came upon a post in the Cisco forums below:

However, the modified scripts posted expired and I am hitting a dead end
there.

Yes, I know there are 3rd party products but we are looking for
alternatives.

Has anyone successfully implemented this?  If so could you share your
information with me?  

Thank you in advance.


 


Posted by: chilldill
<http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB%3
Fcmd%3Ddisplay_user_info%26location%3D.ee9eba9/4&author=chilldill>  -
network Administrator, Bentonville Public Schools - Oct 13, 2003,
10:07am PST


I work for a school district and we were researching the possibility of
using our IP Phones as an intercom system. The district was kicking
around the idea of deploying phones to each of the classrooms in a
building and if we are doing that, why not utilize the phones as an
intercom and save the money in running cables and speakers to each
classroom. 

So we downloaded the IP Phone SDK and looked at a few sample programs
that they provide. One was the intercom service that allows two phones
to talk back and forth via RTP streaming. We simply modified the program
so that it would multicast to various phones, or unicast to a single
phone. We then gathered the IP's of all the phones and then had the
program either multicast or unicast to groups based on IP's. If we only
wanted to send a message to First Grade, then the multicast is sent to
all IP's that we have designated as First Grade. Or we could do an
All-Call, and multicast to all the IP's. This is simply adding a page
that they have the option to choose who they want to call and the code
then multicasts (or unicasts) to the appropriate IP(s). 

There were a couple of extra things that also needed to change for our
environment. The sample program required push to talk and we needed
handsfree usage for the teachers, and it also required both (or all)
parties to press the Exit button when the intercom was exited by one. So
we modified it to accomidate these needs. 

The sample program is written in JavaScript and runs as an ASP page,
although it would be fairly simple to modify it to run on just about any
platform in any language. Once we modified it, we added it as a service
to the Call Manager and subscribed a phone to that service and it worked
really well. Really doesn't take a whole lot of time, pretty easy to do
actually. 



Alex Pitzner
Sr. Network Engineer

 

215 Market Street
Harrisburg , PA 17101 
Main 717.901.5100
Fax 717.901.3124
Direct 717.901.5124
Alex.Pitzner at HarrisburgU.net <mailto:Alex.Pitzner at HarrisburgU.net> 
www.HarrisburgU.net <http://www.HarrisburgU.net> 

  

  

 

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