I need a VOIP adapter that has at least these characteristics:
- 1 ethernet port, so I can make SIP VOIP calls. The box must allow one or two SIP accounts;
- 1 FXS port, so I can connect it to my analogue telephone line and receive regular calls;
- 1 FXO port, so I can connect my analogue telephone to it;
So, the box should be able to make and receive calls from SIP and from the regular phone line using the same analogue telephone. The box should work by itself. No USB stuff that need the computer on.
I will be connecting this box with my ethernet router that is permanently ON. The router has QoS and DHCP server.
Please refrain from suggesting the following brands: Asus, Linksys and Sippura and also chinese and/or low quality stuff. I have bought VOIP boxes from all these brands and had to return it to the store, because they are all really bad (lost sync, hangs, lack of support, lack of firmware updates, lots of bugs, do not forward callerID to the phone, etc.);
I was looking from trustable brands as Cisco, Alcatel, etc. First grade stuff.
Two of the problems I had with all these boxes I had in the past was:
- the boxes do not pass the callerID information to the phone connected to it;
- they all lost sync to the SIP server, constantly, several times a day;
- they all show constantly hanging and needed restart.
I am in Portugal and I need the box to understand the callerID used here (ETSI DTMF during ring and/or ITU-T V2.3).
So, tell me what brands do you guy suggest and why do you recommend that brand/model in particular?