Page 13  01/2007 AMT/PTD/PBX/0062/1/2EN 
 
 
 
 
 
 
Calls between two PPs 
 
To set up a call between two PPs, the same IP streams must be established beforehand. 
RTP/RTCP streams are established directly between the RFPs managing the PPs, unless the 
PPs are connected to the same RFP. In this case, no RTP packets are transmitted on the LAN by 
the RFP. 
The following figure illustrates this scenario: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OMM 
(RFP in  OMM mode) 
    
 
 
 
 
Signalling 
RFP control interface 
RTP/RTCP 
NeXspan iPBX 
GSI gateway
 
 
Note: VoIP resources are required if an announcement is transmitted to the PP.