Specifications

Appendix A: Preparing Cisco Unified SRST Support for SIP
DTMF Relay for SIP Applications and Voice Mail
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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Check media source packets:DISABLED
Maximum duration for a telephone-event in NOTIFYs:2000 ms
SIP support for ISDN SUSPEND/RESUME:ENABLED
Redirection (3xx) message handling:ENABLED
SDP application configuration:
Version line (v=) required
Owner line (o=) required
Timespec line (t=) required
Media supported:audio image
Network types supported:IN
Address types supported:IP4
Transport types supported:RTP/AVP udptl