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Operational, Basic, and Advanced Parameters
41-001343-02 REV04 – 05.2014 A-84
Parameter –
sip transport protocol
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description The protocol that the IP phone uses to send out SIP messages.
Notes:
• If you set the value of this parameter to 4 (TLS), the phone checks to see if the “sips
persistent tls” is enabled. If it is enabled, the phone uses Persistent TLS on the con-
nection. If “sips persistent tls” is disabled, then the phone uses TLS on the connec-
tion. If TLS is used, you must specify the Root and Intermediate Certificates, the Local
Certificate, the Private Key, and the Trusted Certificates.
• If the phone uses Persistent TLS, you MUST specify the Trusted Certificates; the Root
and Intermediate Certificates, the Local Certificate, and the Private Key are optional.
• This parameter implies keep-alive mechanism.
For more information about Persistent TLS, see “Transport Layer Security (TLS) Set-
tings” on pageA-89.
Format Integer
Default Value 1 (UDP)
Range Valid values are:
0 - User Datagram Protocol (UDP) and
Transmission Control Protocol (TCP)
1 - UDP
2 - TCP
4 - Transport Layer Security (TLS)
Example sip transport protocol: 4
Parameter –
sip registration retry timer
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Specifies the time, in seconds, that the phone waits between registration attempts
when a registration is rejected by the registrar.
Format Integer
Default Value 1800 (30 minutes)
Range 30-1800
Example sip registration retry timer: 30
Parameter –
sip registration timeout retry timer
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Specifies the length of time, in seconds, that the phone waits until it re-attempts to reg-
ister after a REGISTER message times out.
If this parameter is set lower than 30 seconds, the phone uses a minimum timer of 30
seconds.
Format Integer
Default Value 120
Range 30 - 2147483647
Example sip registration timeout retry timer: 150