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@ kenboonejr<br />
<br />
Thanks for the quick response.<br />
<br />
That i was playing around with it both versions yesterday and that thought pop into my head.<br />
&quot;Can you run CUCM ver 8.6 as PUB and CUCM ver 6.1 as SUB&quot;<br />
<br />
Thanks again!!
</div>


@ kenboonejr

Thanks for the quick response.

That i was playing around with it both versions yesterday and that thought pop into my head.
"Can you run CUCM ver 8.6 as PUB and CUCM ver 6.1 as SUB"

Thanks again!!

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<div class="content wysiwyg-content">
GM PEOPLE,<br />
<br />
I have a couple of questions in regards to CUCM. &nbsp;<br />
<br />
1. Is it possible to run <b>CUCM ver 8.6</b> as my Publisher and <b>CUCM ver 6.1</b> as my Subscriber?<br />
<br />
2. Is there pre-loaded SIP firmware on the CUCM ver 8.6 for 7940 phones?<br />
<br />
<br />
Thank you in Advance..
</div>
</div>


GM PEOPLE,

I have a couple of questions in regards to CUCM.  

1. Is it possible to run CUCM ver 8.6 as my Publisher and CUCM ver 6.1 as my Subscriber?

2. Is there pre-loaded SIP firmware on the CUCM ver 8.6 for 7940 phones?


Thank you in Advance..

Cisco VOICE - CUCM PUB and SUB

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

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.