Aastra Telecom 9480i CT Series User Manual

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41-001160-03, Rev 00, Releaes 2.4 

IP Phone Administrator Guide

Transport Protocol

sip transport protocol

The protocol that the Real-Time Transport 
Protocol (RTP) port on the IP phone uses to 
send out SIP signaling packets.

Notes:
1.

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 connection. 
If “sips persistent tls” is disabled, then the 
phone uses TLS on the connection. 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.

For more information, see Chapter 4, 

 on 

.

Local SIP UDP/TCP Port

sip local port

Specifies the local source port (UDP/TCP) 
from which the phone sends SIP messages.

Notes:
1. It is recommended that you avoid the 
conflict RTP port range in case of a UDP 
transport.
2. By default, the IP phones use symmetric 
UDP signaling for outgoing UDP SIP 
messages. When symmetric UDP is enabled, 
the IP phone generates and listens for UDP 
messages using port 5060.If symmetric UDP 
signaling is disabled, the phone sends from 
random ports but it listens on the configured 
SIP local port.

For more information, see Chapter 4, 

 on 

.

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