Specifications

Setting Up Call Handling
H.323 VoIP Call Preservation Enhancements for WAN Link Failures
97
Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Example
The following example defines several patterns of digits for which outgoing calls are blocked. Patterns 1
and 2, which block calls to external numbers that begin with “1” and “011,” are blocked on Monday
through Friday before 7 a.m. and after 7 p.m., on Saturday before 7 a.m. and after 1 p.m., and all day
Sunday. Pattern 3 blocks calls to 900 numbers 7 days a week, 24 hours a day.
call-manager-fallback
after-hours block pattern 1 91
after-hours block pattern 2 9011
after-hours block pattern 3 91900 7-24
after-hours block day mon 19:00 07:00
after-hours block day tue 19:00 07:00
after-hours block day wed 19:00 07:00
after-hours block day thu 19:00 07:00
after-hours block day fri 19:00 07:00
after-hours block day sat 13:00 12:00
after-hours block day sun 12:00 07:00
!
H.323 VoIP Call Preservation Enhancements for WAN Link
Failures
H.323 VoIP call preservation enhancements for WAN link failures sustains connectivity for H.323
topologies where signaling is handled by an entity, such as Cisco Unified CallManager, that is different
from the other endpoint and brokers signaling between the two connected parties.
Call preservation is useful when a gateway and the other endpoint (typically a Cisco Unified IP phone)
are collocated at the same site and call agent is remote and therefore more likely to experience
connectivity failures.
For configuration information see the “Configuring H.323 Gateways” chapter in the Cisco IOS H.323
Configuration Guide, Release 12.4T at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/callc_c/h323_c/32
3confg/4gwconf.htm.
Where to Go Next
The next step is verifying whether you need to configure additional features available on Cisco Unified
SRST. For a description and configuration instructions, see the “Configuring Additional Call Features”
chapter. If you need to configure security, see the “Setting Up Secure Survivable Remote Site
Telephony” chapter, or if you need to configure voicemail, see the “Integrating Voice Mail with Cisco
Unified SRST” chapter. If you do not need any of those features, go to the “Monitoring and Maintaining
Cisco Unified SRST” chapter.