[asterisk-users] Why are 4 ports used for a single call?

[Tom Rymes]

On 01/14/2011 4:19 PM, Bruce B wrote:
> Also, to get the SIP very well as well, SIP uses both TCP/UDP 5060
> right? and why are there recommendations of opening 5000-5082 UDP for
> SIP along with 5060 TCP? Are there any "niceties" to that as well? maybe
> video transmission stuff?

More likely, it's because only one client behind NAT can use port 5060, 
so other clients need to use other ports. Could be another reason, though.

Tom