RCA THOMSON SpeedTouchTM (Wireless) Business DSL Router - Manual (Page 90)

Chapter 7
Scenario 1: Residential user.
E-NIT-CTC-20041213-0013 v0.5
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Expressions We will now have a look at these two expressions. Therefore go to the expression
page and select the service tab.
Expert mode -> IP Router -> Expressions
This will show you a list of service expressions which have been created, if a default
configuration is used.
When we click on the + next to the SIP expression we can see the definitions used
for this expression.
Here we can see that the expression SIP is used for packets :
 of type UDP (proto=17) with destination port 5060.
 of type TCP (proto=6) with destination port 5060.
These two expressions define the protocol and ports used by SIP.
Meaning that when UDP traffic on port 5060 is transmitted the SpeedTouch™ knows
that this is SIP traffic. This also applies for TCP traffic on port 5060.
At the bottom of the page you can see the actual protocol instead of the number.