Sip Call Hold And Resume - Cisco CP-7911G-CH1 System Administrator Manual

How to Configure Cisco Unified SIP SRST

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.
Music-on-hold (MOH) is not supported for call hold invoked from a SIP phone. A caller hears only
Note
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
Cisco Unified SCCP and SIP SRST System Administrator Guide
172
Configuring Call Handling
OL-13143-04