yiucsw

IP01 PSTN port is not working, and the OBI cannot have local access function as SPA3102, so i use ET263 call forward function. It may add additional delay.
I can clear hear the echo after i say "1 2 3 4".
That is why i plan to buy the ATCOM GSM/FXS/FXO device. what is local route.
What is your suggestion. ATCOM GSM gateway or build an ASTerisk server with GSM and PSTN module?

Qnewbie

I have to fine tuned IP01's FXO port. Maybe you need to do that too.

I think "ASK before BUY" is the best you can get right now.

I still need to buy one GOIP. But US$199 is ......

GSM box+SPA3000/SPA3102 has less delay than GOIP, which is the test result from YHChing.

yiucsw

issue is that the only working model is GSM call forward to PSTN.
GOIP(GSM) -> GOIP(VOIP) -> OBI(VOIP) -> OBI(PSTN) is long path.
GSM Box -> Phone port -> PSTN(SPA(3102)).  is much shorter path. but delay inside SPA is still long.
so i guess ATCOM (GSM)-> ATCOM (PSTN) will be the shortest path. ?
do you know anyone has test the environment?

Qnewbie

Ask the sale personnel in ATCOM, they should give you at least the best possible delay time. So you know the scale of delay time.

BTW, Ckleea & bubblestar C-hing have tested the USB stick for voice&SMS. You might ask them for more info in the delay issue. I think it quite reasonable that ATCOM's GSM module has better performance.

ckleea

I have not had time to test delay but overall the performance of a voice call from HK to a USB stick that attached to the server is quite good. Voice quality is really satisfactory.

I am not sure about how to carry callerID from one to another. However, having read your requirement, it seems to me that GOIP may be one of the problems. Internet connection quality is another.

I have tried this configuration and found quality is acceptable except the volume of voice is a bit lower.

laptop on a UK train -> wireless UK -> IP01 (UK) -> asterisk server (HK) -> HKBN -> mobile phone in HK

For SMS, our configuration has no problem on incoming. Chinese characters are received correctly and then sent out by email. For outgoing, we have two options, either command line or through a web gui program. No Chinese character can be sent.