Call Setup for internal calls (LAN):
Call Setup for internal calls (LAN) Call setup for a call to another extension or via a VOIP gateway
In this case, phones are connected directly, 3CX only performs call setup!
2 Ports per Endpoint, one for RTP and one for RTCP! From: 10.0.0.106:42016(42017) To: 10.0.0.121:57158(57159) To: 10.0.0.106:42016(42017) From: 10.0.0.121:57158(57159) Audio Signalling Signalling Ext. 101 Ext. 100 PBX Server
Call setup for calls via provider (WAN):
Call setup for calls via provider (WAN) Call setup for a call via a VOIP provider or an external extension
3CX Phone System “sits in the middle” for better firewall traversal
Port range for RTP 9000- and up (configurable)
STUN request needed to get external IP 82.102.77.26:13882 10.172.0.5:7036 82.102.83.161:9012 10.172.0.110:64050 Audio Signalling Signalling Ext. 144 Ext. 107 PBX Server
Media Server Audio
Slide4:
More VoIP Nuggets and VoIP info at:
http://www.3cx.com/blog