Cisco SRP521W-K9-G1 Administration Guide - Page 160

6 160 Configuring Voice Configuring Voice Settings Network Jitter Level Jitter Buffer Adjustment Determines how jitter buffer size is adjusted by the SRP. Jitter buffer size is adjusted dynamically. The minimum jitter buffer size is 30 milliseconds or (10 milliseconds + current RTP frame size), whichever is larger, for all jitter level settings. However, the starting jitter buffer size value is larger for higher jitter levels. This setting controls the rate at which the jitter buffer size is adjusted to reach the minimum. Select the appropriate setting: low, medium, high, very high, or extremely high. The default is high. Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and down, up only, down only, or disable. The default is up and down. SIP Settings Voice > Line 1-2 > SIP Settings SIP Transport SIP Port The TCP choice provides "guaranteed delivery", which assures that lost packets are retransmitted. TCP also guarantees that the SIP packages are received in the same order that they were sent. As a result, TCP overcomes the main disadvantages of UDP. In addition, for security reasons, most corporate firewalls block UDP ports. With TCP, new ports do not need to be opened or packets dropped, because TCP is already in use for basic activities such as Internet browsing or e-commerce. Options are: UDP, TCP, TLS. The default is UDP. Port number of the SIP message listening and transmission port. The default is 5060. Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models)