Registration Timer Value; Reservation Timer - Siemens optiPoint 410 entry Administrator's Manual

Registration timer value

• This field determines whether the phone sends an expires header in
the REGISTER messages that it sends, and if so, to what value it sets
it. The expires header in a REGISTER is a suggestion to the Registrar
server of how long it should be before the phones registration expires.
To stop its registration from expiring, the phone has to send another
REGISTER to the Registrar before its current one has expired. The ex-
pires value which the phone sends is only a suggestion - the actual val-
ue to be used will be supplied to the phone by the Registrar in the OK
message that it sends in response to the REGISTER. Normally this will
be the same as the value that the phone has suggested, but if the sug-
gested value is outside the Registrars range of acceptable values, then
it could be different.
• The phone actually adds 60 seconds to the value that is puts into the
expires header, so that if the REGISTERs that it sends get delayed be-
cause of a congested network, they will still arrive at the Registrar be-
fore the registration expires.
• As an example, if 10 seconds is entered as the Registration Timer val-
ue, the REGISTER messages that the phone sends will have an expires
header of 70 seconds (10 + 60). If 70 seconds is lower than the Regis-
trars lowest acceptable value, it will ignore the suggested value and
send back its lower limit value, e.g. 90 seconds. The phone will sub-
tract 60 seconds from this, and use that as the amount of time to wait
before sending its next REGISTER, so 30 seconds (90 - 60) later it will
send out its next REGISTER.
• If the Registration Timer is set to 0, the phone will not put an Expires
header into the REGISTER messages that it sends - i.e. it will not make
any suggestion to the Registrar of how long it would like the registra-
tion to remain valid.
• Value range table:
Permitted values
Range
Default value
• Editing by phone: Number Editor ! page 157.
! page 61 ! page 115

Reservation Timer

Determines the timeframe for which a line remains reserved for a user
who is dialling; after this timeframe another user who's phone is using the
same line can access the line.
! page 68 ! page 123
alphanumeric
0, 10 ... 4320 seconds
3600 seconds
Alphabetical Reference
211