VoIP issues from Physics for the ITPG member. A gracious good morning to you...Have I reached the party to whom I am speaking?" . Physics Department March 2010. Adumbration. Terminology How your phones work now How VoIP is different “Five Nines” reliability What it takes to “VoIP”
A gracious good morning to you...Have I reached the party to whom I am speaking?"
The “Holy Grail” of all industries sinceAT&T created a
nationwide phone systemas a monopoly.
Users have grown toexpect this level of service.
Redundancy in everyone of these elementsis required to hit 99.9% uptime
Network server with RAID-5 and voicemail storage $2000-$5000
Ethernet – PRI interface $800-$1500
PRI line transceivers $600
PoE switches ~$40.00 per port
UPSes $500 per switch location
Digital phones $120 - $250 per phone
one interface on VoIP VLAN and one on public net
1 active PRI from Comm Services, using 12 channels,
1 backup PRI from Comm Services, 12 channels, currently used for testing purposes,
will be backup in future
3 call appearances, speakerphone, 3-line LCD display
Digium Asterisk 220.127.116.11
PBX/call management/voicemail/SIP server
used for simplified "GUI" management of devices, extensions, call routing etc.
used to sync configs, voicemail directories for Asterisk, Apache etc. between active and backup server
used for failover - detects active server down and moves virtual IP for SIP registrations to backup server, tells Redfone to send packets to backup server
Digium Fax for Asterisk - provides incoming FAX to individual DIDs via email and beta of outgoing faxes via email attachments (PDF, Word, Excel) using Messinet Asterisk Fax Gateway (open source project)
Digium Skype for Asterisk - provides mapping of unique individual Skype usernames for your organization to incoming DIDs, IVMS etc.
Campus Charges for Analog
Old analog phone lines $24-$27/mo
Campus voicemail $7.50/mo
Campus Charges for PRI
PRI line installation ~$800
PRI transceivers ~$600
PRI line $24/mo per channel – 12 channel minimum
DID numbers $1.68/mo
Known external phone
You can save money…
If you are big enough.