Which Codec Should I Choose; I Am Unable To Register To A Sip Server - ZyXEL Communications P-2608HWL-D1 Support Notes

P-2608HWL Series Support Notes
Note: G.711 u-law or G.711 a-law is country specific. Thus the Prestige is pre-configured to use the one
specific to your country. You can use the CLI to change the codec through Telnet.

Which codec should I choose?

Choose a codec that is also supported on the remote VoIP host since both ends of the VoIP connection must use
the same codec. In general, a codec with low bandwidth consumption and high voice quality is a good codec.
What do I need in order to use SIP?
The following lists the minimum requirement for running VoIP applications.
1. A high-speed Internet connection. You can connect to the Internet using a cable or DSL modem. Or subscribe
to high-speed network services such as ISDN, DSL or T-1. The bandwidth requirement varies depending on
the amount of traffic in your network.
2. A PC with VoIP software installed or an external VoIP gateway (such as an ATA or the Prestige 2608 VoIP
station router).
3. An account from a VoIP services provider (such as an ITSP). The account can be configured to recognize
your calls automatically, or you can require the users to enter their assigned unique account numbers.

I am unable to register to a SIP server.

If you are unable to register to a SIP server, do the following.
1. Make sure the Internet connection is up and that you are able to pint the SIP register server from the LAN
behind the Prestige. If your register server uses a domain name, make sure DNS name can be resolved. If you
are using a static WAN IP address, make sure the DNS server is configured correctly on your Prestige.
2. Make sure the SIP account is correct and the password is keyed in correctly. They may be case-sensitive.
3. Check if there is a NAT router install before the Prestige which is a VoIP station gateway. It is strongly
NOT recommended that you install a NAT router in front of the Prestige as this may cause unexpected
problems. If you still want to install a NAT router, use a VoIP ATA (VoIP Analog Telephone Adapter), such as
the Prestige ATA series, instead.
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