cisco ip phone sip

Unanswered Question
Dec 9th, 2009

Is there a reason I can't change a remote home office phone to sip rather

than using ASA phone proxy or using some kind of  vpn tunnel

I have this problem too.
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Jonathan Schulenberg Wed, 12/09/2009 - 07:43

The two reasons that come to mind immediately are:

  1. It would be entirely unsecure and would require you to expose your UCM servers directly to the Internet.
  2. Cisco Unified IP phones do not perform STUN or other NAT/firewall traversal. You might have difficulty getting the phone to function properly outside of TLS or VPN tunnel.


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