11-24-2009 02:44 AM - edited 03-15-2019 08:34 PM
Hi,
We have a VoIP solution that is currently directly connection from the ISP router into our network. I need guidance on how to configure VoIP to traverse a firewall.
We have a secure redundant solution for the data connection, but I have no idea when it comes to VoIP as to which ports and protocols to allow/ block with achieving optimum security.
Attached are diagrams of a) current set-up and b) what I’m aiming for.
Any help is appreciated. Thank you.
11-24-2009 03:39 AM
Your phones use SCCP or SIP protocol to communicate with CM + TFTP for config and firmware, you need to open RTP stream to phones - not sure where is your voice GW. Probably you will need HTTP/HTTPS or someting more like LDAP or Cisco Directory.
More less that's all but best option is to check with ISP what need to be open exactly.
rate if this help
11-24-2009 12:13 PM
Take a look at this: http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/prod_maintenance_guides_list.html
There is a TCP and UDP port usage document under each version of Call Manager. They are a pretty good guide as to what you may need to open in your firewall.
Thanks,
Adam
Please rate if helpful
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