Specifications

Setting Call Control Options
ShoreTel 7.5 Administration Guide 9 – 31
Admission control
algorithm assumes RTP
header compression is
being used
To enable this feature, select the check box.
Enable Media
Encryption
To enable this feature, select the check box. Note that
encryption occurs at the application layer and that only calls
inside a ShoreTel network will be encrypted. Once the call
passes through TDM filtering the encryption is stripped
away and the conversation is no longer encrypted.
Always Use Port 5004
for RTP
By default, this box is checked. You should clear this check
box to enable interoperability with third-party SIP devices.
Note: All IP Phones and switches must be rebooted for
settings to take effect. Failure to reboot may result in one
way media.
Trunk-to-Trunk Transfer and Tandem Trunks
This lets you manage trunk-to-trunk transfers when the
Allow Trunk-to-Trunk Transfer parameter is enabled on
the Telephone Features Permissions class of service edit
page. The field is defined in the section called “Telephony
Features Permissions” on page 10-3.
The ShoreTel system supports trunk-to-trunk transfers,
which allow a user to transfer an external caller to an
external number. Since this feature can lead to unwanted
toll charges, the system also supports a class of service
permission that only grants this feature to selected user
groups. To grant this permission, you enable the Allow
Trunk-to-Trunk Transfer parameter on the Telephone
Features Permissions class of service edit page.
Users with trunk-to-trunk transfer permission might
accidently transfer an external caller to an external number
without realizing it. This can lead to “hung” trunks,
resulting in the inability to make outbound calls or take
inbound calls.
The ShoreTel system lets you manage trunk-to-trunk
transfers using the Call Control Options page. This lets you
eliminate unwanted trunk-to-trunk transfers while ensuring
that valid trunk-to-trunk transfers are not dropped.