2009 archive

CCNA Voice Study – Integration Models

PBX– Traditional model, phones all have a unique DN perhaps DIDs. Calls come into a receptionist for direction and users must use an access digit of sorts like 9. Keyswitch – Model in which all phones have a common lines on all of them. All users can see when a line is in use and …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-integration-models/

Debuging H323 Dial-Peers

Today has been a long day. I’ve been trying to get 4 analog DID, and 4 analog DOD lines working on a 2811 with one FXO and one FXS DID card. Some very useful debug commands in this process have been. debug voip dialpeer allThis allows me to see when I place an outbound call …

Continue reading

Permanent link to this article: https://tripplehelix.net/debuging-h323-dial-peers/

CCNA Voice Study – Licensing Requirements

IOS License – Straight forward the license for the version of IOS you will be running on the ISR. Feature License – Is the number of phones that the CUCME will be able to support. Think of it as attached to the ISR verses the phone. Phone User License – Is the actually license for …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-licensing-requirements/

CCNA Voice Study – CUCME Platform Limits

Platform Number of Phones 1861 8 IAD2430 24 2801 24 3250 10 3270 50 2811 35 2821 50 2851 100 3725 144 3745 192 3825 175 3845 250

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-cucme-platform-limits/

CCNA Voice Study – Unified Messaging Platforms

Product Number of Users Redundancy Support E-mail Support Server or Router Based Unity Express Up to 250 No Relay voice-mail to outside e-mail server Router Unity Connection Up to 7,500 No Relay voice-mail to outside e-mail server Server Unity Up to 7,500 per server. Expandable to 250,000 with multiple servers. Yes Integrates directly with MS …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-unified-messaging-platforms/

CCNA Voice Study – Call Processing Platforms

Product Number of Users Redundancy Support Server or Router Bassed UC500 8 to 48 No Router CUCME Up to 250 depending on router No Router CUCMBE Up to 500 No Server CUCM 30,000 per cluster Yes Server

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-call-processing-platforms/

CCNA Voice Study – Cisco VoIP Structure

Much like the OSI model Cisco has a standardized reference model to explain the various components that make up a unified communications system. From top down: Endpoints – IP Phones, Cell Phones, Video Phone, IM Client aka what the user touches. Applications – Voice Mail, Conference Call Apps, Call Center Apps, 911 Services aka feature …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-cisco-voip-structure/

CCNA Voice Study – PoE

Cisco pre-standard PoE verses 802.3af PoE Cisco pre-standard PoE Process1. Device connected to switch. 2. Switch sends a Fast Link Pulse (FLP) tone to the device. Only unpowered Cisco pre-standard PoE device will loop the FLP back to the switch. 3. Switch receives pulse back and applies a minimal amount of power (6.3W) to the …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-poe/

CCNA Voice Study – IP Phone Boot Process

Phone connected to Ethernet switch port. Receives power either via 802.3af or Cisco-Proprietary POE. Cisco switch delivers voice VLAN information to the phone via CDP. Phone now in voice VLAN initiates DHCP request. Switch relays this to DHCP server via ip-helper command. DHCP server offers phone IP address including DHCP option 150, better known as …

Continue reading

Permanent link to this article: https://tripplehelix.net/ccna-voice-study-ip-phone-boot-process/

Re: New Author

Well first off, I would like to thank Tim for the warm welcome. Something about my background, much like many people in this field the skills and knowledge I have obtained, come from dealing with issues every day. I have been working in the IT field since 1996, starting in UNIX support, with some light …

Continue reading

Permanent link to this article: https://tripplehelix.net/re-new-author/