Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 277

Cisco SPA 500 Series and Wireless IP Phone Field Reference Ext Tab B Parameter RTP TOS/DiffServ Value RTP CoS Value Network Jitter Level Jitter Buffer Adjustment Description ToS/DiffServ field value in UDP IP packets carrying RTP data. Defaults to 0xb8. CoS value for RTP data. Defaults to 6. Determines how jitter buffer size is adjusted by the IP phone. 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. Defaults to high. Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and down, up only, down only, or disable. Defaults to up and down. SIP Settings Parameter SIP Transport SIP Port Description Select from UDP, TCP, or TLS. Defaults to UDP. Port number of the SIP message listening and transmission port. Defaults to 5060. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 266