voptech GoIP, User Manual

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You can now make a call from anywhere in the world via a VoIP network and then terminate the call via a GoIP
/ WoIP to the local telephone network (PSTN). On the other hand, you can also make a call from the local
telephone network to a GoIP / WoIP (the GSM phone number) and then dial another number via a VoIP
network to anywhere in the world. In these two cases, a VoIP Service provider is required for one side of the
call termination. For two fixed locations, it is possible to setup GoIPs at both ends for call terminations
without subscribing to a VoIP Service provider.
GoIP / WoIP can also be used to achieve GSM roaming via VoIP. The idea is to route all your incoming GSM
calls to a GoIP / WoIP via call forward or simply insert your SIM card to a GoIP / WoIP. You can then setup the
GoIP / WoIP to forward all incoming calls to another GSM number in the world via a VoIP service provider.
The charge per call from a VoIP service provider is significantly lower than the roaming charge.
For office environment, GoIP / WoIP offers a quick way to replace the traditional PSTN lines or T1/E1 lines to
your IP PBX.
There is no initial installation/reallocation charge and no need to wait for installation.
Depending on our usage, you can add or remove lines as per your requirement. You can even configure the
system so that everybody calls the same number regardless the number of lines available.
Throughout this manual, GoIP or WoIP is referred as “the device”.
3.2 Protocols
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TCP/IP V4
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Dual VoIP protocols: ITU-T H.323 V4, IETF SIP V2.0

Multiple Codecs: ITU-T G.711 Alaw/ULaw, G.729A, G.729AB, and G.723.1
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H.2250 V4
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H.245 V7
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H.235 (MD5, HMAC-SHA1)
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RFC1889 real-time digital transmission protocol
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NAT
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STUN
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Network Management Protocol (NMP)
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PPPoE Dial Up
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PPP Authentication Protocol (PAP)
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Internet Control Message Protocol (ICMP)
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TFTP
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Hypertext Transfer Protocol (HTTP)