VOIP SUPPORT

NETWORK READINESS

No matter the size of your business, preparing your network for a Voice over IP deployment is crucial for a successful installation. This guide provides requirements, recommendations, and best practices to prepare your network for Comporium’s Business Voice with Webex Collaboration. It is strongly suggested that you work with your IT professional to ensure that your service is dependable and without interruption

CAPACITY OR BANDWIDTH

The most common problem customers have with
SIP voice quality occurs when there is not enough
bandwidth available to handle the SIP traffic or the SIP traffic is not separated from other traffic types. Without adequate bandwidth users will experience sustained packet loss and poor voice quality.
Each voice or SIP Session (think of this as an active call) requires a minimum of 100K per concurrent call. High-quality video sessions require 512K and higher.

NETWORK SERVICE LEVELS

Voice quality is also directly related to latency and packet loss on your network. Understanding these areas can help greatly improve call quality.

VoIP Network Requirements for Ideal Call Quality

Latency (delay) <150ms
Packet Loss <1%
Jitter <30ms

WIRING

Minimum recommended wiring for Voice over IP is CAT5. CAT5 supports 125Mhz however CAT6 can support up to 250Mhz.

If you find that you are experiencing issues with Jitter on CAT5, it may be time to upgrade.

CONVERGED NETWORKS

IP connectivity should match that of your network.

Ex. Gigabit Network =Gigabit phones

EQUIPMENT

Phones, headsets, laptops, and cell phones can play a significant role in the quality of your calls.
IP phones must be added in the Comporium web portal and will arrive to you ready for Zero-Touch Provisioning.

To download this information in a PDF, click here.

PRE-QUALIFYING YOUR NETWORK

To test your network connections for Webex Calling, click here.
Note: This web-based tool should be tested from a device within the business network that will be using the Comporium Business Voice and Webex Collaboration Solution.

MODEM SETTINGS

Disable SIP ALG (application layer gateway) in the modem

SIP ALG is by default turned on in your modem. Please contact your Internet provider to have this option disabled.
SIP ALG must also be disabled on all routers and switches carrying SIP traffic.
If your modem is already configured as a passthrough, go to Router/Firewall Settings.

MAKE VOICE A PRIORITY

Please read and understand the requirements, recommendations and best practices listed in this guide. You must agree to prepare your network, prior to installation and to the best of your ability to ensure that IP voice service will function as expected.

ROUTER/FIREWALL SETTINGS

If connecting to a modem it should be configured as a passthrough.
You may also need to disable additional functions in your router or firewall, such as those below, depending on the manufacturer. Please consult your IT professional or the manufacturer’s documentation.
- SIP Application Layer Gateway (SIP ALG), also referred to as SIP Transformations
- Deep Packet Inspection (DPI)
- Application Layer Access Control
- Stateful Packet Inspection (SPI), also called Dynamic Packet Filtering
- Intrusion Detection/Intrusion Prevention System (IDS/IPS)
- Web Proxy operation
- WAN Acceleration
Firewall Timers
- UDP and TCP timers should be set to 120 seconds or greater

To download this information in a PDF, click here.

SPEED TEST

For optimal and accurate speed test results, we recommend using the Google Chrome web browser. Speed tests conducted using Internet Explorer will produce inaccurate results.