intercom

Posts Tagged ‘intercom’

postheadericon Are You VoIP Ready? – The “X” Factor

One X factor you will need to consider when looking at a VoIP solution is your network s vulnerability to viruses, worms and Trojans. The first thing I caution customers about when they want to go all out and purchase a pure  IP telephony solution is that as a general rule, you want to keep your local voice and local data traffic separate. In practice, this means if you already have a voice infrastructure (i.e. jacks specifically for telephone
sets that home run to a main telephone room or the IT Head End  room without connecting to the LAN wiring), put your voice on that with TDM sets instead of abandoning the wires that are in place.
Voice and data packets going out to other offices that are linked to you through a Point to Point or VPN connection will inevitably share time on the same Internet circuit. However, TDM sets are not affected by anything on the LAN until they have to connect to some off site device through VoIP. Regular local traffic such as voice mail retrieval, intercom calls, paging to the warehouse or calling a supplier over the PSTN will occur with or without a data switch or server in place.
If you do decide to go all IP, then do it when you can make a fresh wiring start and run a separate cable for voice and data sets. Also, keep the voice devices on their own subnet separated from the other LANs by a decent router. RonEK is not a Cisco reseller but we like their routers and recommend them in cases like this.
Many IT people would take issue with this approach but I have personally witnessed and been victim to what can happen as shown in Figure 4. As you can see, everything looks great until the main server on the LAN was hit by a very aggressive virus. For about 2 hours it created such havoc on the LAN in the form of broadcast storms that all network traffic was reduced to a crawl and VoIP was stopped cold.