Aastra Telecom 480I CT manual Configuring, Step

Configuring the IP Phones

Advanced Network Settings

			Configuring
	Aastra Web UI
Step	Valid values are 4000 to 64000. Default is 4000.
	Action
5	In the "Timer 1 and Timer 2" fields, enter a time, in milliseconds, that will apply to an IP phone
	session. These timers are SIP transaction layer timers defined in RFC 3261.
	Timer 1 is an estimate of the round-trip time (RTT). Default is 500 msec.
	Timer 2 represents the amount of time a non-INVITE server transaction takes to respond to a
	request. Default is 4 seconds.
6	In the "Transaction Timer" field, enter the amount of time, in milliseconds, that the phone allows the
	callserver (registrar/proxy) to respond to SIP messages that it sends.		the
	Note: If the phone does not receive a response in the amount of time designated for this parameter,
	the phone assumes the message has timed out.
7	In the "Transport Protocol" field, select a transport protocol to use when sending SIP Real-time		IP
	Transport Protocol (RTP) packets. Valid values are User Datagram Protocol (UDP), Transmission
	Control Protocol (TCP), or both.
			Phones
8	In the " Registration Failed Retry Timer" field, enter the amount of time, in seconds, that the phone
10	In the " Registration Renewal Timer" field, enter the length of time, in seconds, prior to expiration,
	waits between registration attempts when a registration is rejected by the registrar.
	Valid values are 30 to 1800. Default is 1800.
9	In the " Registration Timeout Retry Timer" field, enter the amount of time, in seconds, that the
	phone waits until it re-attempts to register after a REGISTER message times out.
	Valid values are 30 to 214748364. Default is 120.
	that the phone renews registrations.
	For example, if the value is set to 20, then 20 seconds before the registration is due to expire, a new
	REGISTER message is sent to the registrar to renew the registration.
	Valid values are 0 to 214748364. Default is 15.
11	Click	to save your changes.

41-001129-00 Rev 09, Release 1.4.1 4-49