Session Initiation Protocol (SIP) Chapter 9: Network Requirements and Preparation
•There is no difference in the user experience for encrypted and unencrypted calls.
Encryption is essentially transparent, and the user will not know if the call is being
encrypted or not.
•Encryption is not supported on the SoftSwitch, so calls to voice mail or auto
attendant are not encrypted.
9.12.2 Supported Platforms
The media encryption feature is supported on the following hardware.
Encryption is not supported on ShoreTel IPBX switches or on the IP 100.
For instructions on enabling media encryption, refer to the section on Call Control
Options in the ShoreTel 8 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.
Platform Type Model
Switches • ShoreGear 1U Half-width voice switches
• ShoreGear 1U Full-width voice switches
IP Phones • IP110
Table 9-15 Platforms Supporting Media Encryption