Voice; About Sip & Voip - NetComm NB9 User Giude

Voice

About SIP & VoIP
Voice Settings
The NB9/NB9W has the ability to connect two regular telephones via the Phone1 and Phone2 ports
on the rear of the unit and provides a number of sophisticated call-management functions such as
call forward, call waiting, call transfer and so on. The following section provides further details of
how to set up VoIP services, and then how to use the advanced telephony functions offered by the
NB9/NB9W.
Note: You can use separate VoIP accounts from your VoIP Service Provider
but not separate accounts with different VSPs. This means that you can
configure your NB9/NB9W to provide two telephone extensions.
VoIP services are usually provided through a standard technology called SIP, briefly described as
follows.
About SIP
SIP, the Session Initiation Protocol, is a signalling protocol for Internet conferencing, telephony,
presence, events notification and instant messaging. SIP is the Internet Engineering Task Force
standard for multimedia conferencing over the Internet. SIP is designed to address the functions
of signalling and session management within a packet-switched network. Signalling allows call
information to be carried across network boundaries while session management provides the ability
to control the qualities and attributes of an end-to-end call.
The Session Initiation Protocol is a peer-to-peer protocol. There are four components in the SIP
standard:
• User Agent (UA)
• Proxy Server
• Registrar Server
• Redirect Server
In effect, this means that when you sign up for a VoIP account based on a SIP server, your 'VoIP'
number and account details are managed by the SIP server at the VoIP Service Provider premises; by
entering your SIP details (e.g. 'sip.serviceprovider.com') along with your VoIP/SIP account number
and your account password, you are 'registered' with the service and able to make VoIP calls in
practically the same way as with a traditional phone service (but for a much smaller cost.)
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YML790 Rev1
NB9/NB9W ADSL2+ VoIP Router