The information below explains how Sharpen phones stay connected and pass traffic on a local network.
SIP has two pieces to it.
1.) 5060 UDP traffic, this is the information about the call IE: Phone 1 calling Phone 2 via server xyz
2.) 10000-20000 UDP Traffic - This is the RTP Stream it hold the actual packets of voice data that make up the phone call.
While at rest the phones only send 5060 data as a 'Keep Alive' method for NAT, during this period there is no RTP traffic. However, once a phone call is made and audio established RTP traffic is sent from the phone to our servers.
If you phones are connected and able to make phone calls with out Audio issues then you are sending RTP traffic, the monitor system you are using must just be missing the data. As for QoS, deciding to put QoS on your local LAN is completely up to you. It comes down to how much traffic as well as how much power the network has.
For example: if have a single 24 port 10/100 switch and you connect all 24 ports to computers and each computer is transferring at full capacity it would be a very good idea to install QoS. It is the case that the internal network has more available bandwidth then it really needs so internal QoS is not needed.
For QoS on your firewall we recommend that you set priority for both 5060 as well as 10000-20000 for the voice traffic.
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