Continuation of  VoIP Gateways

Continuation of  VoIP Gateways,

Things get a bit more complex when considering two other factors in VoIP Gateways:

1. VoIP protocols
2. Voice codecs

For a VoIP gateway to work properly, the protocol and codec employed must be compatible with the VoIP phone system or VoIP service being used. Incompatible protocols and codecs can cause the system not to work efficiently and can cause low call quality.

VoIP protocols

A VoIP protocol is a method of transporting voice packets across a network.

A VoIP gateway will typically support a single protocol.

The most common VoIP protocols are:

• Session Initiation Protocol(SIP) – SIP is a standards-based protocol that is used and supported by the vast majority of VoIP phone systems and services.
• Cisco Skinny Client Control Protocol(SCCP) – SCCP is a proprietary protocol used by Cisco’s Call Manager and IP phones.
• MGCP – MGCP is an older VoIP protocol you might come across, This protocol is not widely used or supported.
• H.323 – Similar to MGCP, H.323 is an older VoIP protocol that, but is no longer widely used and or supported.

VoIP Codec

A voice codec is a method of encoding and decoding digital data streams or signals. A voice codec is responsible for the compression of your voice stream within a digital packet. It also determines sound quality and bandwidth required to send the packet.

If the data or signal is compressed more it results in lower voice quality or If the data or signal is compressed less it results in higher voice quality

A VoIP gateway typically supports multiple voice codecs.

The most common voice codecs used by VoIP Gateways are:

• GSM – 13 Kbps
• iLBC – 15 Kbps
• G.711 – 64 Kbps
• G.722 – 48/56/64 Kbps
• G.726 – 16/24/32/40 Kbps
• G.728 – 16 Kbps
• G.729 – 8 Kbps

If you’re the person responsible for the set-up, installation and maintenance of a VoIP gateway you want to know more knowledge in the area of protocols and codecs. If not, simply make sure your VoIP gateway supports the same protocols and codecs that your VoIP service and or VoIP phone system support.

Standard VoIP gateway Configurations:

Configurations found in the VoIP Gateways are listed below:

The number of ports you will need on your VoIP gateway is dependent on the number of lines or devices you are looking to connect to the VoIP gateway. For example, if you want connect your VoIP phone system to your two PSTN lines, you will need a two FXO analog VoIP gateway.

Ports Available in FXS gateways & FXO gateways

• 4 Port
• 8 Ports
• 16 Ports
• 24 Ports
• 48 Ports

Digital gateways

• 1T1, 2T1, 4T1
• 1E1, 2E1, 4E1
• 1BRI, 2BRI, 4BRI

For More details or information on Grandstream VoIP Gateways, Contact Grandstream Singapore call at +65 65470561 or Send an inquiry to sales@grandstream.com.sg  Next blog will be updated soon on VoIP Gateways.