Polycom SIP 2.2.0 Administrator's Manual page 120

Administrator's Guide SoundPoint IP / SoundStation IP
Attribute
voIpProt.server.x.transport
voIpProt.server.x.expires
voIpProt.server.x.expires.overlap
voIpProt.server.x.register
voIpProt.server.x.retryTimeOut
A - 8
Permitted
Values Default
DNSnaptr or DNSnapt
TCPpreferre r
d or
UDPOnly or
TLS or
TCPOnly
positive 3600
integer,
minimum
300
positive 60
integer,
minimum 5,
maximum
65535
0, 1 1
Null or 0
non-negativ
e integer
Interpretation
If set to Null or DNSnaptr:
If voIpProt.server.x.address is a
hostname and voIpProt.server.x.port is 0 or
Null, do NAPTR then SRV look-ups to try to
discover the transport, ports and servers, as
per RFC 3263. If
voIpProt.server.x.address is an IP
address, or a port is given, then UDP is used.
If set to TCPpreferred:
TCP is the preferred transport, UDP is used if
TCP fails.
If set to UDPOnly:
Only UDP will be used.
If set to TLS:
If TLS fails, transport fails. Leave port field
empty (will default to 5061) or set to 5061.
If set to TCPOnly:
Only TCP will be used.
NOTE: TLS is not supported on SoundPoint
IP 300 and 500 phones.
The phone's requested registration period in
seconds.
Note: The period negotiated with the server
may be different. The phone will attempt to
re-register at the beginning of the overlap
period. For example, if "expires"=3600 and
"overlap"=60, the phone will re-register after
3540 seconds (3600 – 60).
The number of seconds before the expiration
time returned by server x at which the phone
should try to re-register. The phone will try to
re-register at half the expiration time returned
by the server if that value is less than the
configured overlap value.
If set to 0, calls can be routed to an outbound
proxy without registration.
If set to 0 or Null, use standard RFC 3261
signaling retry behavior. Otherwise
retryTimeOut determines how often retries
will be sent.
Units = milliSeconds. (Finest resolution =
100ms).