VTech ET685 Administrator And Provisioning Manual page 399

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Configuration File Parameter Guide
ET685 Administrator and Provisioning Manual
If your VoIP provider works only when you turn on Support broken registrar
on the phone's web interface, this means your provider does not call your
phone the way the phone requested to be called. What happens is that
incoming INVITEs from your VoIP provider do not contain the contact URI
which was previously registered by your phone as its contact. Thus the
phone cannot safely identify the target line of the incoming call. When you
compare the URI in the first line of the incoming INVITE and the URI in the
Contact of the REGISTER, which the phone sends to the registrar of your
provider, they will presumably differ. This is what we mean by broken
registrar. It is as though your provider has sent a letter to an apartment
building with the city, the street address, and the house number on it, but
without the recipient's name. When you turn on Support broken registrar,
the phone tries to find the right apartment by guessing, but this guessing
will fail when there are two parties with the same name in the building.
on, off
off
user_srtp
Your phone supports RTP encryption via SRTP. If you want to encrypt your
outgoing audio (RTP) stream, this option must be on. Both parties have to
enable the RTP Encryption option to establish an SRTP call. RTP
encryption has nothing to do with SSL/TLS. The keys are sent in the SDP
part of SIP messages. Certificates are not used for this.
In FW Version 6 the default value is "off", you have to switch it to "on" in
order to have SRTP enabled. Then, a small lock sign is shown on the
display if STRP is active during a call, this means that an SRTP encrypted
call is currently taking place.
In FW Version 7 the default value is "on". In order to obtain full security SIP
call you have to use TLS as well. Then, a small lock sign is shown on the
display which means that an secure SIP call is currently taking place (SIP
secured + RTP encrypted).
on, off
on
user_stream
This setting is obsolete. Please use setting user_moh instead.
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