2N NetSpeaker Manual page 33

IP filter
The parameter helps secure the NetSpeaker Server against undesired call attempts via
the given SIP Gateway. Tick off this option to make the PBX process only the requests
coming from trustworthy IP addresses included in the list. Add, remove or modify an IP
address to/in the list using the buttons to the right of the IP address list or the context
menu retrieved in the IP address list with the right–hand mouse button.
Other parameters – SIP
Always mediate RTP – enable this parameter to route the RTP stream via the
PBX VoIP card in all cases. Otherwise, the RTP stream might be routed outside
the PBX (for VoIP – VoIP connections) and the PBX processes only signalling for
such a call.
Reverse RTP negotiation – tick off this option to set the codec negotiating
method. If you do not tick off this option, the PBX offers codecs in the INVITE
message.
Use short headers – tick off this option to use abbreviated header items for
outgoing SIP packets. Example: From = f, To = t, Via = v. This optimisation
helps minimise data to be transmitted.
Do not replace +,#,* in numbers – if you do not tick off this option, the above
mentioned characters will be replaced with adequate strings %xx in numbers.
Tick off the option to send the characters.
Route by To header – if you tick off the option, incoming call routing on the
port will obey the
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Figure: Other Parameters
To header setting. Otherwise (and by default!), calls are
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