TIPTEL 3275 User Manual page 97

Call
Session Timer
User Agent

DTMF Payload: To configure payload type for DTMF.
Note: By default, DTMF type is RFC2833 which is the
standard. Type Inband uses inband frequency to indicate
DTMF tone which is most used to be compatible to
traditional telephone server. Type Info use SIP Info message
to indicate DTMF message.
To display and configure call-related features.

Max Local SIP Port: To configure maximum local sip port
for designated account.

Min Local SIP Port: To configure minimum local sip port
for designated account.

Caller ID Header: To configure which Caller ID format to
fetch for displaying on Phone UI.

Auto Answer: If enabled, IP phone will be auto-answered
when there is an incoming call for designated account.

Provisional Response ACK: 100% reliability for all
provisional message, this means it will send ACK every
time the IP phone receive a provisional SIP message
from SIP server.

user=phone: If enabled, IP phone will send user=phone
within SIP message.

Anonymous Call: If enabled, all outgoing call for the
designated account will be anonymous number.

Anonymous Call Rejection: If enabled, all incoming
anonym-out call for the designated account will be
rejected.

Missed Call Log: To display the miss call log.

Prevent SIP Hacking: Enable to prevent SIP from hacking.
To display or configure session timer settings.

Active: To enable or disable this feature, If enable, the
ongoing call will be disconnected automatically once the
session expired unless it's been refreshed by UAC or
UAS.

Session Expire: Configure session expire time.

Session Refresher: To configure who should be response
for refreshing a session.
Note: UAC means User Agent Client, here stands for IP
phone. UAS means User Agent Server, here stands for SIP
server.
One can customize User Angent field in the SIP message; If
user agent is set to specific value, user could see the
information from PCAP. If user agent is not set by default,
user could see the company name, model number and
firmware version from PCAP
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