Administrator’s Guide for SIP-T58V/T58A/T56A/CP960 IP Phones2421-Enabled, SDP media connection address c=0.0.0.0 per RFC 2543 is used when placing a call on hold.Default 0Web UI Features->General Information->RFC 2543 HoldParameter account.X.hold_use_inactive[1] .cfgDescriptionIt enables or disables the phone to use inactive outgoing hold signaling.Note: It works only if “sip.rfc2543_hold" is set to 0 (Disabled). It is not applicable to CP960 phones.PermittedValues0-Disabled, SDP media direction attribute “a=sendonly” is used when placing a call on hold.1-Enabled, SDP media direction attribute “a=inactive” is used when placing a call on hold. RTP packetswill not be sent or received.Default 0Parameter features.play_hold_tone.enable .cfgDescription It enables or disables the phone to play the call hold tone when you place a call on hold.PermittedValues0-Disabled1-EnabledDefault 1Web UI Features->General Information->Play Hold ToneParameter features.play_hold_tone.delay .cfgDescriptionIt configures the time (in seconds) to wait for the phone to play the initial call hold tone.If it is set to 30 (30s), the phone will wait 30 seconds to play the initial call hold tone after you place a callon hold.Note: It works only if “features.play_hold_tone.enable” is set to 1 (Enabled).PermittedValues Integer from 3 to 3600Default 30Web UI Features->General Information->Play Hold Tone Delay[1]X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.Music on Hold (MoH) ConfigurationWhen a call is placed on hold, the phone will send an INVITE message to the specified MoH server account accordingto the SIP URI. The MoH server account automatically responds to the INVITE message and immediately plays audiofrom some source located anywhere (LAN, Internet) to the held party. For more information, refer to draft RFC draft-worley-service-example.The following table lists the parameters you can use to configure music on hold.Parameter account.X.music_server_uri[1] .cfgDescriptionIt configures the address of the Music On Hold server. The URI points to a Music On Hold (MoH) server.Examples for valid values: <10.1.3.165>, 10.1.3.165, sip:moh@sip.com, , com> or yealink.com.Note: The DNS query in this parameter only supports A query.
