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cqaliher,<br />
They can use communicator just fine, just can't make calls using RCC. &nbsp;Does that change your suggestions at all? &nbsp;(Our phone system is avaya and I dont know anything about it, but I can get that team to check anything that I need.)<br />
<br />
Thanks!
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cqaliher,
They can use communicator just fine, just can't make calls using RCC.  Does that change your suggestions at all?  (Our phone system is avaya and I dont know anything about it, but I can get that team to check anything that I need.)

Thanks!

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Nope. Doesn't change anything for me. Still a matter of following the SIP packets from source to destination.
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Nope. Doesn't change anything for me. Still a matter of following the SIP packets from source to destination.

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This didnt get me exactly where i needed to resolve it. &nbsp;my telephony group finallu resolved it by rmoving &amp;&nbsp;recreating the phone switch.
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This didnt get me exactly where i needed to resolve it.  my telephony group finallu resolved it by rmoving & recreating the phone switch.

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<div class="content wysiwyg-content">
Most of my users can make calls from communicator without issue. &nbsp;I have one site that cannot. &nbsp;The error that they get is &quot;Cannot connect to the phone system. &nbsp;An unidentified error has occurred. &nbsp;Please try again. &nbsp;If the problem persists, please contact your system administrator.&quot; &nbsp;<br />
<br />
Our integrated phone system is Avaya.<br />
Users are enabled for Remote Call Control<br />
The telephony group is looking at this too and they cant find any issues. <br />
<br />
We do have quite the mess of a firewall grid, so I am thinking maybe thats it, but I'm not sure what ports to check for this.<br />
<br />
Any advice is appreciated!<br />
<br />
Susan
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Most of my users can make calls from communicator without issue.  I have one site that cannot.  The error that they get is "Cannot connect to the phone system.  An unidentified error has occurred.  Please try again.  If the problem persists, please contact your system administrator."  

Our integrated phone system is Avaya.
Users are enabled for Remote Call Control
The telephony group is looking at this too and they cant find any issues. 

We do have quite the mess of a firewall grid, so I am thinking maybe thats it, but I'm not sure what ports to check for this.

Any advice is appreciated!

Susan

&quot;cannot connect to the phone system&quot;

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

&quot;cannot connect to the phone system&quot;

"cannot connect to the phone system"