Cisco CP-7911G-CH1 Administration Guide - Page 172
SIP Call Hold and Resume, Examples
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How to Configure Cisco Unified SIP SRST Configuring Call Handling SIP Call Hold and Resume Cisco Unified SRST supports the ability for SIP phones to place calls on hold and to resume from calls placed on hold. This also includes support for a consultative hold where A calls B, B places A on hold, B calls C, and B disconnects from C and then resumes with A. Support for call hold is signaled by SIP phones using "re-INVITE c=0.0.0.0" and also by the receive-only mechanism. No configuration is necessary. Note Music-on-hold (MOH) is not supported for call hold invoked from a SIP phone. A caller hears only silence when placed on hold by a SIP phone. Examples Router# show running-config Building configuration... Current configuration : 1462 bytes configuration mode exclusive manual version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption service internal ! boot-start-marker boot-end-marker ! logging buffered 8000000 debugging ! no aaa new-model ! resource policy ! clock timezone edt -5 clock summer-time edt recurring ip subnet-zero ip cef voice-card 0 no dspfarm voice service voip allow-connections h323 to h323 allow-connections h323 to sip allow-connections sip to h323 allow-connections sip to sip sip registrar server expires max 600 min 60 voice register global 172 Cisco Unified SCCP and SIP SRST System Administrator Guide OL-13143-04
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