yiucsw

china/hk in/out network path may not be the same. and port congestion also.
i try to set the ip01 to port 10000 but not all device support this. so finally give up.

For me. the  best service up to right now from china/hk is ET263 to ET263. which is very reliable. and the sound quality is good. much better than obi service.
Complain for obi service is non-stopped. especially the first 3 sec silent after pick up the phone.

yiucsw

dead silent. my girlfriend give me a hard time after i switch to OBI110. her side is Vigor 2910Vg. my side is OBI110. After she pick up the phone, there is no voice coming out of headset, sometimes i can hear her voice and sometimes she can hear me. It take few second before both side can listen. It is painful.

yiucsw

Also the sound quality in the first 10 second is better, then it become better and better. Which mean OBi110 start the SIP/network optimization after the conversation start.

Although one side is vigor router, I have not set up the VPN yet, so cannot compare with 雯雯 environment. as VPN already define the network package traffic. That is why i need to buy multiple vigor router to reduce the network package issue.

yiucsw

Currently  i have two Vigor (2910/new 2920n) in hong kong. and 1 in GZ(new 2920n).  Need to buy 1 more in macau. Regret for failing to install a 2930n in macau. which is incompatible to intel 5100agn. Although spending days with draytek support, it is fix some issue but has other issue pop up. finally I bought an new 6205 to fix the issue. (for me, the 6205 is very good)
Seems the 2930n is too high end for my low bandwidth network. which general traffic are slowing down for wireless connection. so can only use it as a general 2930 VPN gateway. for hong kong, it is not strong to penetrate walls.  
Need to go thru another tough price negotiation for another 2920n. (each time, the shop increase the price!!!)

I believe there is many defects in the OBI110 especially OBI110 to OBI110 voip, so another trick to overcome it is to call OBI110's PSTN line. the local PSTN operator have very good filter/module to reduce echo, delay issue. or use OBI110 with ET263.