2N PBX 2N NetStar - Configuration Manual v2.6.0 - Manual (Page 37)

SIP virtual ports 3.6
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port. Within context menu is another option for setting features of selected codec.
DTMF according to RFC2833 – With this option you can enable transmission of DTMF according to
RFC2833.
Fax T.38 – With this option you can enable fax transmission according to recommendation T.38. If
this option is checked, it is changed to link with advanced settings. Recommended setting is TCF –
Transfer, Error correction – Redundancy and No compression.
3.6.3 Advance settings
SIP
Always mediate RTP – If this option is checked, all calls are connected through the VoIP board. PbX
serves as RTP proxy. If this option isn't checked, VoIP calls are connected directly terminal to
terminal (only RTP streams) and they don't charge the PbX.
Reverse RTP negotiation – With this option you can define way of codecs negotiation. If this option
isn't checked, codecs are offered already in the message Invite.
Use short headers – It enables using of short headers (e.g. From = f, To = t, Via = v).
Dedicated Registrar – It is used only on gateway and it enables to transfer registrations to another
destination.
Address – Address of selected Registrar server.
Port – Port of selected Registrar server.
Aliases
This section enables to define addresses which will be also accepted. It is used for PbXs situated
behind NAT. Address of the packet and address in it can be different.
RTP
TOS – This section defines outgoing parameters for all packets. This setting is then used by network
elements.
Figure 4 View of dialogue box for managing advance parameters of VoIP.