Linksys SPA922 Cisco SPA9000 Voice System Administration Guide - Page 266
Voice, SPA400 Field Reference, Voice Codecs
UPC - 745883570836
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SPA400 Field Reference Setup C IP Tos/DiffServ Call Signaling Packets RTP Packets Session Enable Session Timer Desired Refresh Time Minimum Refresh Time TOS field in IP header for outgoing SIP packets Default: 68 TOS field in IP header for outgoing RTP/RTCP packets Default: b8 Enables the SPA400 to encode the Timer header in all INVITE requests for ringing timeout (checked by default) Desired session timer in seconds (0 by default) Minimum value of the session timer in seconds (0 by default) Setup tab> Voice NOTE The default settings should be sufficient in most use cases. These settings should be adjusted only after consultation with a service technician for the telephone company. It is essential that these settings are compatible with those of the Central Office. Voice Codecs Preferred Codecs Preferred Codec Voice Codecs Packetization VAD The preferred voice codec that SPA400 uses to negotiate with remote VoIP devices to determine the voice codec for a call: G.711U, G.711A, or G.729 The packetization time in milliseconds for each codec: G.711U, G.711A, G.729 Voice Activity Detection (OFF or ON) Default: OFF SPA9000 Voice System Administration Guide 264