Linksys SPA921 Cisco SPA9000 Voice System Administration Guide - Page 244
Network Settings medium, very high, extremely high, up and down, up only, down only, disable
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SPA9000 Field Reference Voice tab B Voice tab > FXS 1/2 page Network Settings section SIP ToS/DiffServ Value SIP CoS Value [0-7] RTP ToS/DiffServ Value RTP CoS Value [0-7] Network Jitter Level Jitter Buffer Adjustment TOS/DiffServ field value in UDP IP packets carrying a SIP message. Default: 0x68 CoS value for SIP messages. Default: 3 ToS/DiffServ field value in UDP IP packets carrying RTP data. Default: 0xb8 CoS value for RTP data. Default: 6 Determines how jitter buffer size is adjusted by the SPA9000. 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. Default: high Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and down, up only, down only, or disable. Default: up and down Voice tab > FXS 1/2 page SIP Settings section SIP Port SIP Remote-Party-ID Port number of the SIP message listening and transmission port. Default: 5080 To use the Remote-Party-ID header instead of the From header, select yes. Otherwise, select no. Default: yes SPA9000 Voice System Administration Guide 242