Paging simultaneously to IP phones and legacy overhead

Unanswered Question
May 18th, 2012

I just wanted to share something with the community as it is something I have seen a number of posts on and somethign we struggled with as a company before stumbling on this ingenious solution.  I can't take credit for this, we found it online (Also sorry if this is a repost)

There is a simple, if somewhat kludgy way to do this.  Any time we have a customer who needs to page both to an overhead and the phone simultaneously what we do is purchase a very basic model IP phone such as a 7912.

You then open that phone up and attach a single pair from a Cat5 cable to the leads for the phones speakerphone.  Drill a small hole for your cable to come out of the phone and attach the other end of the pair to your overhead paging system.  In this way, users need only dial the DN for the IP to IP phone paging and it will broadcast over both the phones and the overhead simultaneously without any sort of complicated additional configuration.

This is handy as a number of people I see on these forums aren't terribly familiar with the command line and this method requires no configuration that can not be done with CCA.

I hope this helps you guys, I know it's certainly been a great time saver for us when installing CME and UC500 systems!

I have this problem too.
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bwagenberg Wed, 09/12/2012 - 13:17

What about the impedance mismatch between the speaker output and the Hi-Z or mike level input of the PA amplifier?  How does it sound?

We too are EXTRAORDINARALY disappointed that Cisco would let this issue go unresolved for several years -- - FXO or FXS ports cannot be added to a paging group.

I just passed Cisco's Certification, this is our first UC5xx sale, and our customer wants their old Avaya reinstalled, over this issue.  IT IS IMPORTANT, CISCO... because that's how every other phone system works.  "All Page" means all!

Someone, please direct me to a little interface box, with a Skinny IP telephone protocol, that will let me connect an external analog PA system to the Paging Group, OR would Cisco be so kind as to add this function to CCA -- so an FXS port can be added to a paging group.  Then I can use my regular Bogen TAMB2 interface.

Please hurry.

Bruce Wagenberg

Broadcast Engineering Services Co.  (Cisco Partner)

847-835-0223

bruce@bces.net

mcasimirc63 Thu, 09/13/2012 - 07:13

Are you not able to create a STCAPP FXS phone and add it to the hunt group?

c.holloway Thu, 09/13/2012 - 08:57

Bruce,

I've never run into any sound quality issues.  The overhead pages all sound fine.  Additionally I've not had to make any impedence changes.  Really the only thing I've ever had to change were just the output levels on the overhead system to raise or lower the volume but this trick has really been a boon to us for situations exactly like you describe.  Customers want the transition to be seemless and if anything works differently it becomes a deal breaker.  I can't believe Cisco hasn't come up with an official way to universally page but this should do the trick for you.

Unfortunately I've not done any of the actual physical work to hook the cable up to the internal speakers, someone else in my company has always done this.  I know we're not the first to do this as we got the idea from someone else online so there may be a video up on youtube.

An additional caveat I would have you be aware of is that if they want ring out over the overhead, you're going to need to use a phone with multiple buttons (unlike the 7912s we typically use).  So its a matter of balancing needs of customers against cost.

bwagenberg Fri, 09/14/2012 - 09:53

Which model phone is he cheapest that will do the job, of attaching to it's speaker?  500 series, 7900 series... so many.  I assume a model without a display.

bwagenberg Fri, 09/21/2012 - 12:48

Alexander:

The problem with a server based solution like Cyberdata's is that it creates a delay in a live page.  If the listener can hear both paging from the telephone speaker AND the (delayed) overhead PA system, the combination of live and delayed would be garbled.  Unacceptable.

Thanks for your reply.

BTW:  We attempted to contact the 2 companies listed in your thread and carefully read their web sites, after difficulty finding them.  Both were hard to contact and the replies received were uninformative. 

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Posted May 18, 2012 at 11:59 AM
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