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Troubleshooting Notes #3

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CRCX

I’m on a roll tonight.  Here are some more troubleshooting/FYI notes, this time focused on SRST.  The study life of a dedicated CCIE candidate is one constant stream of information absorption occasionally interrupted by family time, eating, sleeping, and relieving oneself in the bathroom.  Sometimes the latter gets delayed by long chapters on gatekeeper behavior (as I’m experiencing right now!).

DLCX

Be aware of the following SRST restrictions:

  1. Extension mobility does not work in SRST mode when using call-manager-fallback.  CME as SRST does have extension mobility, but login information is not seamlessly transferred during failure situations.
  2. SRST does not have a concept of partitions or calling search spaces. CoR can be used to some extent, but it is a weak-comparison and is not automatically populated on the SRST router.
  3. MWIs might be out of synch when recovering from SRST mode.
  4. All forwarding (busy, no answer, and forward all) is lost in SRST mode.
  5. In SRST mode, all call routing decisions are made on the SRST gateway through dial peer configuration, so anything not explicitly configured on the SRST gateway will not work.

For SRST mode, be sure to configure voicemail under “telephony-service” and to configure an “ephone-dn template” to set the necessary call-forward noan and busy behaviors.

Set your DHCP lease times to several days, or use a local DHCP server to ensure that IP Phones do not reset themselves when their lease expires during a WAN outage.

Use transfer patterns to allow transfers to non-IP Phone destinations.

Written by Matthew Berry

July 15th, 2010 at 6:58 pm

Posted in SRST,Troubleshooting Tips

CCIE Voice Lab Exam v3.0 Topics

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The blueprint is a detailed outline of the topics likely to appear on the lab exam. This blueprint introduces pre-configurations of basic tasks (such as phone registration, basic application integration, basic dial plan, etc.), in order to devote additional focus on expert level skills (advanced configuration and troubleshooting) assessments. As usual, knowledge of troubleshooting is an important skill and candidates are expected to diagnose and solve issues as part of the CCIE lab exam. The topics listed are guidelines and other relevant or related topics may also appear.

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Written by Matthew Berry

August 9th, 2009 at 6:19 pm

Posted in 01 Campus Infrastructure and Services,02 I&T CUCM Endpoints,03 I&T CUCME Endpoints,04 I&T Voice Gateways,05 I&T Call Routing Policies,06 I&T High Availability Features,07 I&T Media Resources,08 I&T Supplementary Services,09 I&T Other CUCM Voice Apps,10 I&T QoS and CAC,11 I&T Messaging,12 I&T Cisco Unified Contact Center Express,13 I&T Cisco Unified Presence,AAR,Advanced Configuration,Barge,CODEC Selection and Flexibility,CUCM Presence,CUCM SCCP Endpoints,CUCM SIP Endpoints,CUCME SCCP Endpoints,CUCME SIP Endpoints,Call Admission Control,Call Handling and Routing,Call Park,Call Pickup,Callback,Cisco Unity Connection,Cisco Unity Express,Conference Bridges,DHCP,H.323,H.323 RAS,IP-IP Gateway & CUBE,IPMA,L2 LFI,L2 and L3 Queuing Mechanisms,L2 and L3 Traffic Classifications and Policing,Media Resources Preference and Redundancy,Mobility and Single Number Reach,Music-on-hold,NTP,Other CUCM Media Resources,Other CUCM Voice Applications,Other Supplementary Services,RSVP,Redundancy,Route Patterns and Dial-peers,Route Selection Preference and Redundancy,SRST,Script Customization,Server Integration,T1 and E1 CAS,T1 and E1 PRI,TFTP,Transcoder,VLAN