Soft Telephones


What is your opinion on soft telephones?  We have this on one of our sites in USA and the network is running extremely slow.  I didn't implement the phone system but I believe they are using a Hosts PBCX and are then being directed to the iPhone.  The soft phones and the desktops are obviously on the same network, could this be causing slowness.  

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Cliff GaliherCommented:
Very unlikely. Think about it this way. Your average 15Mb broadband connection can stream 4k video from Netflix. Audio from a softphone is a drop in the bucket compared to that, and LAN networks are much faster. Unless you really are still running 10Base-T. Please tell me no.

It is recommended to run VoIP on a separate network because network traffic can cause call quality issues. Not because VoIP saturates the network.
AkinsdNetwork AdministratorCommented:
To be on a safe side, I'll say stay away from using VOIP and Data on the same subnet even if you've prioritized the traffic through QoS.
- consider VOIP traffic as "fragile" and Data traffic as aggressive. While data traffic can be re-transmitted when a packet falls off, VOIP does not have that capability and calls will drop off.
- Security reasons. Any savvy person on the network can sniff phone conversations if voice and data subnet are on the same subnet.
- If your data traffic is heavy, you will experience slowness as your soft phones depend on the connections from your computer even regardless of your fast connections.

Simple experiment.
Go on a site and download a file. View the progress of the download and not down the speed. Click on the same file and download it again while the other one is still downloading and watch the speed for both files. You will notice a drop in speed aside of the effect of throttling.

Note also that in addition to network speed being shared, computer resources are also being shared.

Overall, even if you have enough room to accommodate both, it's still not advisable to keep both together on the same network.

As Cliff mentioned, saturation would not be the main factor if you have enough bandwidth.

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