VOPTech Document Four Channel’s GSM VoIP Gateway
Copyright@2009 VOPTel Technology Co., Ltd All Rights Reserved.
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supports Qos, select this field accordingly. Please consult your network administrator
for further information.
E
）
DTMF Signaling
1
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DTMF TYPE
DTMF signals can be sent over to the called party once a call is established. GoIP4
Gateway supports both Inband and Outband DTMF signal types.
For Inband DTMF type, DTMF signals are generated locally at the calling phone and
then send to the called party as part of the voice signals. This method is not reliable
since the quality of the DTMF signals is subject to the Codec used and the quality of
the network traffics.
For Outband DTMF type, DTMF signal commands are sent to the called party and the
actual DTMF signals are actually generated by the called party. This method allows
more reliable DTMF signaling. However, it requires the called party to support this
feature in order for this to work properly. GoIP4 Gateway supports both RFC2833 and
SIP INFO Outband DTMF protocols.
2
）
DTMF Payload Type
DTMF Payload Type is by RFC2833 protocol to carry the tone definitions for various
applications. The default DTMF Payload Type is 96. Please consult your VoIP service
provider for the proper setting if required.
3.4.3 Media Setting
Click on “Media Settings” in the “Call Setting” menu to access the parameters available
for media settings.
