Snom 320 - Manual (Page 79)

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[ S N O M 3 2 0 M A N U A L V 1 . 0 0 ]
Proposed Expiry: You can select the time when the registration
on this line is to expire. Upon expiration of the registration, the phone will
send a fresh re-registration request.
Auto Answer: Line-specifi c “Auto Answer” can be used to establish
an intercom functionality. Set it to “on”, map the number of the extension
to be reached by intercom onto one of the programmable keys on the
page “Function Keys”, and set the key type to “destination”.
Long SIP-Contact (RFC3840): When your SIP Registrar is not
properly supporting long contacts specifi ed in accordance with RFC3840,
you may want to switch this behavior off.
Support broken Registrar: If your VoIP provider works only when
you turn on „Support broken registrar“ on the snom 320’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 fi rst 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 fi nd the right apartment by guessing, but
this guessing will fail when there are two parties with the same name in
the building.
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