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Technical Analysis of Hosted Voice over IP Solutions for Small and
medium Enterprises
George NjorogeCSCIE 139
Hosted vs. Managed VoIPHosted VOIP is utilizing a company for phone
connectivity (soft and hard), extensions, voicemail, using the hosted company’s equipment.
Managed VoIP is your equipment often hosted at some datacenter and utilizing a consultant to manage it.
Reasons to Use a hosted Provider
Lower Capital ExpenseMore than one officeNo in-house VOIP ExpertCall CenterNew FeaturesExecutive Home Users
Options for Hosted VoIP
Utilize the same ISP as the local LAN for VoIP traffic
Utilize a Managed Line and Managed VoIP Gateway
Option 1Utilizing the same ISP as the LAN for VoIP traffic
has the following possible issuesJitter
Any jitter on the phones will create popping and clicking even if the packets arrive within the time frame of 300-400 milliseconds.
Latency Poor call quality due IP packets arriving at different
intervalsPossible Call dropCould be great 90% of the time and 10% poor qualityNo QOS
Option 1 configuration
Hosted VoIP Provider
Firewall
POE Switch
VoIP Phones
ISP
LAN Switch
VLAN 200
VLAN 300
Option 2Managed Line
MPLSMPLS labels are encapsulated in the VoIP packet
voice/RTP/UDP/IP/MPLS-labels
VoIP Gateway DeviceTraffic shaping in the system is designed to ensure that high
priority real-time data is processed before lower priority non-real-time data.
Guaranteed QoS
Option 2 configuration
Corporate LANManaged Voip
Network
ISP Managed Line (MPLS)
Firewall VoIP Gateway - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Executive Home UserHosted VoIP
Provider
VoIP Gateway/Firewall
Home ISP (Cable, DSL,
Fiber)
Small POE Switch
Wireless Access Point
Mobile Client AccessCall Forking “find me follow me”
The hosted PBX can be activated to use the find me follow me feature. This means when enabled, the phone will ring at the predefined mobile number on the pbx. This will be a 3G/4G call and will not utilize data.
Mobile Client App The Mobile client app will act as a soft phone. The
client will work over the data plan on a wi-fi connection. If none exists, it will utilize the data plan
TroubleshootingISP based option
Run trace route command to check for any packet drops
Run a Ping to the hosted ISP to see if there is any packet loss
Check network latency using tools internally and externally. (www.speedtest.net)
If Phones have no connectivity, check wiring, and port connection.
TroubleshootingManaged Line connection
If call quality is low, we can contact our provider as they provide the line
Check logs in the VoIP GatewayNo phone connectivity, check the wiring and
data ports
TroubleshootingSoft phones
Check headset connection into the PC and microphone configuration
Check for high CPU usage on the PCNetwork connectivity. Soft phones do not work
in an ISP based configuration. They require a VPN to the hosted VoIP server.
Check Workstation Firewall
Troubleshooting Executives Home Phone
Check the VoIP gateway for any issuesVerify valid internet connection Check for connection speedsCheck wiringCheck SwitchCheck connectivityContact VoIP provider