Specifications

Setting Call Control Options
9 – 30 ShoreTel, Inc.
Session Interval
(90-3600)
Enter the number of seconds in the Session Interval field to
specify the keepalive interval at which heartbeats will be
broadcast. The heartbeat will be sent out at the specified
period and if no response is received, the session will be
dropped. (See RFC 4028 for details on this parameter.)
Refresher Use the Refresher drop-down menu to specify whether the
SIP Session Timer will be applied to the caller or callee.
Choices are None, Caller UAC, and Caller UAS. (See RFC
4028 for details on this parameter.)
Voice Encoding and Quality of Service
Intra-Site Calls (calls
within a site)
This drop-down list lets you select the type of encoding
used when making calls within your site. Choose one of
these encodings:
• Linear Broadband (256 Kbps)
• Linear (128 Kbps)
• G.711 (64 Kbps)—the default
• ADPCM (32 Kbps)
• G.729a (8 Kbps)
Inter-Site Calls (calls
between sites)
This drop-down list lets you select the type of encoding
used when making calls between your sites. Choose one of
these encodings:
• Linear Broadband (256 Kbps)
• Linear (128 Kbps)
• G.711 (64 Kbps)
• ADPCM (32 Kbps)—the default
• G.729a (8 Kbps)
FAX and Modem Calls This drop-down list lets you select the type of encoding
used for faxing or when calls are made from a modem.
Choose one of these encodings:
• Linear (128 Kbps)
• G.711 (64 Kbps)—the default
Maximum Inter-Site
Jitter Buffer
This parameter sets the maximum size of the jitter buffer. A
larger jitter buffer might result in more delay between
calling parties, which might degrade the quality of service.
The buffer can be set from 20 to 300 msec. The default is 50
msec.
DiffServ/TOS Byte Enter a Types of Service (TOS) value or a DiffServ value,
whichever your network currently supports. This byte is
applied to media originating from all ShoreGear physical
switches (SoftSwitches excluded) and IP phones. The value
entered in this field must be a decimal number 0 to 255.