NEC UNIVERGE SV9100 Manual page 116

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T.38 Fax Relay
Standard SIP extensions now have the ability to communicate using the T.38 Fax Relay protocol.
By default any Fax tones transmitted to or from a Standard SIP extension will be sent as audio tones in the
speech path. It is possible that these tones can be misinterpreted by the receiving device because of
packet loss or errors due to the codec compression.
T.38 Fax Relay is a way of converting the Fax tones into a signal then sending the signal across the IP
network where the signals are converted back to Fax tones.
The Standard SIP device must be compatible with T.38 for this to work.
Enable Fax Relay by using the 'Fax Relay Mode' option in Easy Edit– Advanced Items/VoIP/SIP Terminal
Options/SIP FoIP Settings (PRG84-33).
The SIP extension must also be set as a 'Special' using the Terminal Type option in Easy Edit– Advanced
Items/VoIP/SIP Terminal Options/SIP Terminal Settings (PRG15-03-03).
There are several other options to do with T.38 Fax relay that can also be found in Easy Edit– Advanced
Items/VoIP/SIP Terminal Options/SIP FoIP Settings (PRG84-33), these commands would usually be left at
the default settings but may occasionally need altering depending on the SIP device, fax machine and
network connection.
IP Duplication Allowed Mode
Easy Edit – Advanced Items/VoIP/SIP Terminal Options/SIP Terminal Settings (PRG15-05-18).
By default the SV9100 allows one SIP registration per IP address.
In certain circumstances multiple extension numbers may be required to be registered via the same IP
address, e.g. Cisco ATA has two extension connections but only one IP address. With this scenario the
second registration from the same IP address would overwrite the first registration. To overcome this
limitation it is necessary to enable the SIP extensions for IP Duplication Allowed Mode. This allows multiple
registrations from a single IP address and also allows the SIP registration to be overwritten by another IP
address.
This command should be done before the SIP extensions are registered to the SV9100.
Automatic IP Duplication Allowed Group Assignment
This feature automatically assigns the IP Duplication Allowed Group when registering either IP DECT, UCB
or BCT SIP extensions.
This means that the IP Duplication Allowed Group setting does not need to be programmed prior to
registering the extensions to the SV9100.
The SV9100 detects that the registration request is from one of the above devices and assigns the SIP
extensions to use IP Duplication Allowed Mode accordingly.
If the IP Duplication Group has been set manually prior to the registration request then the feature will not
be activated for that SIP extension, it will keep its manual group assignment.
Be aware that this feature will only work for IP DECT, UCB and BCT. Other devices that require IP
Duplication Allowed Mode will need assigning manually.
Peer to Peer SIP Video
It is possible to communicate directly between Standard SIP extensions using Video.
This is only possible if SIP Peer to Peer is enabled and SIP CTI is disabled, if any of these conditions are
not met video communication will fail.
Check the SIP Peer to Peer and SIP CTI settings in Easy Edit– Advanced Items/VoIP/Extensions/SIP