Information Technology Reference
In-Depth Information
branch IP phones might be routed out the branch gateway or the main location gateway,
depending on design.
Figure 10-4
Phone URLs Changed from Hostnames to Host IP Addresses
The signaling and voice bearer stream paths are the same as in the single-site deployment;
the difference is simply that the branch phones send all signaling traffic over the WAN to
the CUCM server, along with on-net RTP voice streams to IP phones at other locations.
However, if a branch phone calls another branch phone, both phones signal to the CUCM
across the WAN, but the RTP voice streams stay local to the branch—direct from phone
to phone, as always. Figure 10-5 illustrates Centralized Remote Branch call flow.
SCCP/SIP
S
CCP/SIP
IP
RTP
IP Phone
IP Phone
Figure 10-5
Centralized Remote Branch Call Flow
