Review of Keenetic Line: VoIP Sluice and MicroATL for Home and Small Business

Review of Keenetic Line: VoIP Sluice and MicroATL for Home and Small Business

To begin with, Keenetic Liner is an addition to and separate from the company's routers, i.e., in the routers of other vendors or, let's say, with the PC, can't work. Part of the functionality is owned by the router itself, but Linear doesn't load it too much, because the hardest part — sound processing itself and other service operations — is assigned to the SkyWorks Si32287 Dual Channel ProSLIC chip, which works in partnership with the Silicon Labs microcontroller EFM32HG310F64. All this good, as you've already guessed, is inside Linear.

Linear itself is a rather compact and energy-efficient solution that connects to the USB 2.0 port and is compatible even with the younger Keenetic models that have that port. True, using a hardware solution rather than a purely software solution places a limit on a list of supported codecs that is limited to two, but almost the most popular options are G.711u and G.711a. There are two RJ-11 FXS ports, each with its own readiness indicator.

The main plus Linear for business users is savings, because Linear allows multiple SIP connections with flexible controls to be activated at once and saves the usual interface for end-users, i.e. a regular telephone tube. The last point, by the way, may also be relevant for those with older relatives, especially those living outside the city, and in some cases Linear will help to eliminate the services of a local monopoly in the area of wired telephones.

Technical specifications Keenetic Liner Price $30
Technical specifications Keenetic Liner Price $30

To work with Linear.

There are several ready profiles for different countries that adjust some parameters like the FXS port impedance. For each port individually, you can set the volume level of the incoming and outgoing audio, set the SIP line, and indicate the port number and name. The last two points are needed to organize internal direct communication between the phones. The port name will be displayed on a local incoming call. It is also possible to "ping" the port, i.e. send a call to it, which may be useful for debugging or searching for a lost tube.

The same tab contains settings to control parallel calls that can be held, rejected or intercepted, and you can switch between them or re-routed to another local phone. Specific buttons on the machine that will be responsible for these functions can be self-appointed. This is a useful functionality, but you have to practice and remember which key is responsible, and you have to consider that these manipulations are not instantaneous, but delayed at least in a second or so.

Depending on how and how the SIP lines are linked to ports, the logic of operating with multiple incoming calls to the same number may differ. For example, if one line is allowed for both connected phones, then in response from one machine to the first incoming call, the second input will be directed to the other. At the SIP line level, the SIP line can be re-routed to the same number, and there are also a number of options: an unconditional translation of the call, a diversion in case the line is active or no response within a given time frame, which would not be prevented by the availability of a schedule. Important clarification is that re-routing support in this case should be from the SIP connection, i.e. an IP ATC, local or provided by, for example, an operator.

The default exiters go through the SIP line, which has the highest priority for outgoing calls, which are, however, ignored when forced to choose the SIP line. The rules can be drawn up by themselves or ready templates can be found, for example, to send all calls to local numbers through one SIP provider and the intercity through another.

To avoid confusion, you can check directly on the web interface of Keynetic to check which SIP line will send a call to a given number. Another option is the rules for replacing the prefix of the telephone number. This is useful for sub-assembly to a specific SIP service provider in order to enter the machine in its usual form or to return when the incoming number is transmitted in the wrong format. In the certificate, as usual, there is a detailed description of the settings with examples. There are also, to say the same, commands for managing some additional settings that are only available through command line densities.

For all SIP connections, there are common settings for local ports UDP/TP/TLS and RTP, as well as an opportunity to send a STUN server address. For convenience, there are more than a dozen finished profiles for a number of popular SIP providers, where only a log and password will be sufficient to connect. If there is no finished profile, then you will have to look to the operator for connection parameters and perhaps try a little bit or go deeper into the checkup. In general, there are all the necessary settings. It is worth noting the possibility of using Linear on a router located behind the NAT or, for example, when SIP traffic is trapped in a VPN tunnel. SIP- and RTP-packs on the router are processed and transferred first, and the system process NVOX itself, which is responsible for the telephone, is prioritized.

By default, G.711u codes are used, but the priority can be changed. In general, in a relatively short period of time, some very serious problems have not been detected. However, some interlocutors pointed to the existence of a weak echo, but it was not possible to find out whether it was linked to the work of the DECT tube, Linear itself, or SIP service providers.

♪ Conclusion

Keyenic has been able to make a useful and unusual product again. Linear is an excellent addition to the routers of this brand for those who still need analog telephones. Of course, there are a lot of softphones and it's time to go to masseuses, but the ergonomics of "classical" tubes are still important to many, and somewhere it's the only way to access fixed communications.

In any case, even in the Keenetic brand store, it's worth 1,690 rubs, and in the retail, you can find it for less than $28, and that, according to "I. Marquet", is about 1.5 times less than the price of the simplest Chinese Vop phone or lock that isn't gonna be able to reach Linear by function, while the link between the Linear and the Keenetic budget router itself and the USB-port is on average still cheaper than the more or less decent lock of at least two FXS ports, and it's not worth forgetting about the ability of the Kenetic router itself in such a bundle. In the future, developers are planning to add support for the use of multiple Linears on a single router, including by connecting the dongles through compatible USB habes.