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Thank you for the information.
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<div class="content wysiwyg-content">
Hello,<br />
<br />
I've got a need to connect some Cisco IP phones through an IPSEC tunnel. This involves connectivity to both the remote Cisco Call Manager server and other IP phones.<br />
I'm all set with the IPSEC piece and am now looking to open up only the ports required. Can anyone tell me what those ports are?<br />
<br />
Thanks.
</div>
</div>


Hello,

I've got a need to connect some Cisco IP phones through an IPSEC tunnel. This involves connectivity to both the remote Cisco Call Manager server and other IP phones.
I'm all set with the IPSEC piece and am now looking to open up only the ports required. Can anyone tell me what those ports are?

Thanks.

Connectivity Requirements for a Cisco IP Phone Connection Through a Firewall ?

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.