Polycom SIP 3.1 - Manual (Page 267)

Configuration Files
A - 113
Missed Call Tracking
You can enable/disable missed call tracking on a per-line basis.
In the following table, x is the registration number. IP 301, 320, 330, 430: x=1-2;
IP 501: x=1-3; IP 550, 560: x=1-4; IP 600: x=1-6; IP 601: x=1-12;
IP 650, 670: x=1-34; IP 4000: x=1; IP 6000: x=1; IP 7000: x=1.
Call Waiting
This configuration attribute is defined as follows:
Attribute
Permitted
Values
Default Interpretation
call.missedCallTracking.x.enabled 0, 1 1 If set to 1 or Null, missed call tracking is
enabled.
If call.missedCallTracking.x.enabled is
set to 0, then missedCall counter is not
updated regardless of what
call.serverMissedCalls.x.enabled
is set
to (and regardless of how the server is
configured). There is no Missed Call List
provided under Menu > Features of the phone.
If call.missedCallTracking.x.enabled is
set to 1 and call.serverMissedCalls.x.enabled
is set to 0, then the number of missedCall
counter is incremented regardless of how the
server is configured.
If call.missedCallTracking.x.enabled is
set to 1 and
call.serverMissedCalls.x.enabled
is set
to 1, then the handling of missedCalls depends
on how the server is configured.
Attribute
Permitted
Values
Default Interpretation
call.callWaiting.ring beep, ring,
silent beep Specifies the ring tone heard on an incoming
call when another call is active.
If set to Null, the default value is beep.