Configuring Call Handling
How to Configure Cisco Unified SIP SRST
172
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
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