117 Matrix SETU VFXTH System Manual
• If you want the system to send RTP packets to original IP and Port from where RTP packets are
received, by ignoring the contact information received in SDP, enable the Symmetric RTP check box.
Default: Disabled
• Select the appropriate Secure RTP (SRTP) mode from the following options:
• Disable: SRTP will not be used.
• Enable and optional: Either RTP or SRTP will be used. If you select this mode, you must select the
SRTP Media Type. You can select AVP or SAVP. Default: AVP.
• Enable and forced: Only SRTP will be used.
Default: Disable
• When the system is installed behind a NAT Router, select specific NAT traversal mechanism to be used
as NAT Type. Default: Disabled.
• Select Router’s IP Address, if your SETU VFXTH is located behind the NAT router (any type).
Make sure you disable Outbound Proxy on SIP Trunk and configure the same IP Address under
NAT settings in the “System Parameters” page.
• Select STUN if your system is located behind the NAT router other than Symmetric.
Make sure you disable Outbound Proxy on SIP Trunk and configure the STUN Server Address and
port in “System Parameters”.
• Select the appropriate DTMF sending/receiving mechanism that is compatible with the DTMF sending/
receiving mechanism of your ITSP or remote peer. SETU VFXTH supports:
• In-band: System will send and detect digits in In-band only.
• Outband: System will send and detect digits in Outband events only.
• SIP INFO: System will send and detect digits in SIP INFO message only.
• Outband-->In-band: System will send and detect digits in Outband, if negotiated in offer-answer
else it will use In-band.
• SIP INFO-->In-band: System will send and detect digits in SIP INFO, if negotiated in offer-answer
else it will use In-band.
• Outband-->SIP INFO-->In-band: System will send and detect digits in Outband or SIP INFO, if
negotiated in offer-answer else it will use In-band. If both Outband and SIP INFO is negotiated,
Outband will have priority over SIP INFO.
• SIP INFO-->Outband-->In-band: System will send and detect digits in SIP INFO or Outband, if
negotiated in offer-answer else it will use In-band. If both SIP INFO and Outband is negotiated, SIP
INFO will have priority over Outband.
Default: Outband
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