利用asterisk自建飛線漫遊/漫遊回撥系統

電腦超人

本身香港也有數家也有提供飛線漫遊的公司...
以及網絡商也會提供漫遊回撥功能...
但是也不一定是最便宜的方法...(通常只針對大陸和某些國家才會比較廉宜)


但是自建自家的系統的話...收費便可以自己選擇了...
例如某些公司提供的飛線漫遊...往中國1分鐘約$1左右...

但是自建的話可以這樣做:
香港手機>(飛線)>asterisk>ET263>大陸手機號碼
這樣...便會聽到角色兄喊"啊!7仙1分鐘!"(笑 )

有申請0088的...可以這樣...
香港手機>(飛線)>asterisk>0088>大陸手機號碼
這樣可以全免...(當然大陸號碼是要接聽免費的)

亦例如往日本...
最便宜的好像是0.98...(不知是否手機也一樣)
但是如果自建的話...可以用Google voice的IDD...收費US$0.11(即約HK$0.86左右...)
(PS:請問有更便宜的嗎?)

電腦超人

但自建飛線漫遊有數個問題...

若您本身有號碼的話...便可直接把號碼飛線至asterisk...然後再由asterisk轉駁至當地號碼...
但這樣做的話...當地接收到的來電顯示應該是asterisk的號碼...

另外...接入的時候...
有沒有方法可以辨認到是由那個號碼飛線進asterisk呢...
否則的話...號碼只可一對一...除非有多個HK DID number可接入...

電腦超人

自建漫遊回撥

在外地不少地方接聽也是完全免費的...(有清單嗎?)
所以在漫遊時也可以自建回撥系統...收費差不多等於在香港撥IDD的收費一樣...甚至免費...

除了OBi110可以這樣做...
我想Asterisk也可以...但前提是要有兩條PSTN...(或者用2b的話可以同時撥出2條線...)
一條用作撥出IDD...另一條用作撥到香港本地用...

但可以有什麼方法令asterisk撥到你當地號碼呢?

我曾經考慮過用iNum...申請一個帳號...
由於iNum有不少國家也有當地號碼...可以申請一個...在當地接入asterisk後再由asterisk撥給你...(好像早前也有人研究過)

電腦超人

另外我也曾提出過利用SMS來給asterisk指令...
不過這個由於要寫script...暫時提出來一下...

電腦超人

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電腦超人

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電腦超人

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Qnewbie

For the mainland China, I am thinking of

GOIP (or GSM box+SPA3000)<=> ET263_acc1(mainland) <=> ET263_acc2(HK) <=> Asterisk <=> PSTN/VOIP user

The main idea is simplicity of hardware, which requires almost no maintenance The drawback is obvious, it relies solely on ET263(you down I down).

(PS:請問有更便宜的嗎?)
Plz check the Betamax clone(be aware of no service from Betamax):
http://progx.ch/home-voip-prixbetamax-3-1-2.html
The server is located in Europe, which might have large delay from HK.

角色

回復 8# Qnewbie

How is the voice quality if the most of the end points are using ET263? How about the voice quality after 15 minuties?

YH

Qnewbie

回復 9# 角色


    Actually I have no idea about the voice quality as the GOIP is placed outside mainland China. The deployment is GOIP <=> Asterisk <=> VSP <=> China/Other destinations. Since VOIP is not blocked here, I don't feel any quality drop during calls to China.

The GOIP bought from DBL can communicate with ET263 thru encrypted stream, which increases the chance to break 15-minutes-limit.

YHFung C-hing, have you tested the VPN option?

角色

Would you please tell me more about the following path?

GOIP (outside China) <=> Asterisk (where) <=> VSP (which and where) <=> China/Other

I believe that if the voip packets sent by the GOIP device is not blocked, then either encrypted or plain voip packets will have the same performance.

As for my cases, all SIP clients using ET263 is not encrypted. With the ET263 as the bridge between Mainland China and outside China, the voice quality would not dropped after 15-min conversation.

If the voice over VPN, the voice quality is pretty good. For better performance codec G729 has to be used.


YH

Qnewbie

GOIP (outside China) <=> Asterisk (outside China) <=> VSP (Betamax, Germany?) <=> China/Other

Here the GOIP and Asterisk are within the same LAN(no encryption)。

What I mean is that, the GOIP might help us break the block with encryption in other provinces, which block all plain VOIP traffic including skype.

角色

Thank Qnewbie for providing more information.

I would like to ask you another question, have you experienced any degraded voice quality after a certain period of time without the use of ET263 as the bridge, let say 15 minutes chat if you make calls to China using VoIP only (no ISTP)?

YH

Qnewbie

I use mostly Betamax(as ping value is under 100ms) to make calls to China. I don't experience the quality degraded problem as calls are one-way(outside => China).

You might test with two Betamax(like www.nonoh.net) accounts(free!). As said, the delay might be large from HK.