User's Manual

Chapter 27 Global PBX Settings
ISG50 User’s Guide
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3 However, peer-to-peer calls cannot be made between devices if one of them belongs to a subnet
listed in the localnet table and the other does not.
Furthermore, the devices making a peer-to-peer connection:
• Must have a common codec they can use between them.
• Must use SIPInfo for DTMF.
• Must not be using NAT.
If they cannot meet these conditions, the peer-to-peer connection will fail and the call will be routed
through the ISG50 instead.
For more information on adding different subnets to the localnet table, see Section 27.6 on page
436.
27.7 The QoS Screen
Use this screen to set up DSCP settings for SIP and audio traffic. To access this screen, click
Configuration > PBX > Global > QoS.
Figure 285 Configuration > PBX > Global > QoS
ISG
WAN
3.3.3.3
D
LAN
Local Net = 192.168.1.0/24
192.168.1.54
A