Planning and Installation Guide Chapter 9: Network Requirements and Preparation
For instructions on enabling media encryption, refer to the section on Call Control
Options in the ShoreTel Administration Guide.
9.13 Session Initiation Protocol (SIP)
There are no special network requirements necessary for deploying SIP. The general system
requirements should prove adequate for SIP support. With that in mind, please note the
SIP devices are supported behind NAT(Network Address Translation) as long as
they are configured statically.
To communicate with a SIP device or service provider providing IP trunks over the
Internet, you must be able to pass SIP traffic through your firewall. This requires a
SIP application layer gateway – a feature provided by some firewall vendors.
SIP signaling uses UDP port 5060.
When using SIP, the RTP port for the voice media stream is dynamic and the SIP
endpoints may not always use the same ports to exchange information (in contrast
with ShoreTel’s proprietary protocol, which always uses port 5004). Thus, if you are
using SIP, you must deselect the “Always Use Port 5004 for RTP” check box on the
Call Control Options page in Director so that it is not fixed at 5004.
9.14 Example Network Topologies
9.14.1 Single-Site Implementation
Figure 9-3 is an example of a simple, single-site implementation.
9.14.2 Multisite Implementation
Figure 9-4 is an example of a multisite implementation with various WAN technology
Figure 9-3 Single Site
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