Sip Advanced Configuration - DBL Technology HT-912T User Manual

A) Single Configure: User can make several VOIP channel share the same
configuration.
B) Configure by line: Every VOIP channel can be supported service by different
providers, also login 2 or 4 telephone numbers on the same server, each number
is bundled with corresponding VOIP channel.
C) Configure by group: In this mode, each group can bundled one or several lines,
each line can exist in different groups. That is each line could login on 4 servers.
Notes: The special settings of 3 configuration mode refer to FXS configuration

3.3.3.3.2. SIP Advanced Configuration

SIP advanced option, correspond "Advanced" and "Media". Click "Advanced"
and "Media", the page as following:
A) Signaling Port
SIP local port is the local UDP port, use to communicate with SIP proxy or other
SIP users.
B) NAT Keep
Use to keep the port when NAT communicate with SIP signaling, its unit is
seconds.
C) DTMF Signaling
By using DTMF, the telephone transfer phone-signal to call clearinghouse by audio
tape. That is to say, two different frequencies of sound are combined into 16 kind
of tone. Telecommunications or telecom service hotline like 1860 identifies these
special sounds by DSP, which use to certain the dial-number. DTMF has 2 styles:
Inband and Outband.
1) Inband DTMF
This style makes the special dial-tone together with talk-tone and transfer out
without any treatment. So Inband only has one way to set DTMF signaling.
2) Outband DTMF