Hi, the recommendation for remote phones is that you set a proper VPN for them, so when you have routers that cannod do that, it's better that you replace them.
Note if you have a CME exposed to the internet you're better to limit SIP and H.323 access with ACLS, else you will be likely exploited for toll fraud by people that regularly scans for this type of activities.
In Brazil is very expansive to make a VPN, so many projects of small clients are not on the way.
I make this post, because there are one cisco IP Phone on my client that is rent by one American Bank. And works very good, behind a not so good router (DLink), without NAT. How the CME works to provide this functionality? How it know what ports are available and not denied?
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...