Hi all,
I have a customer who wants to extend POTs (that’s legacy analogue telephones, guess everyone knows that) over a MT wireless link.
Customer is in EU. Seems customer wants proper “dial tone” with traditional phones, not new VOIP handsets.
What’s the recommended equipment for doing this (both ends)?
Zyxel? Multitech? any “favourites” ?
Would love to hear suggestions -
Regards
As VOIP adapters go I like the Sipura SPA-2000 they are realtivly cheap and work quite well.
However, extending service across the wireless. I am running voip users across my mikrotik network however I terminate the pots into a Linux (Fedora core 2) box. And then use Asterisk (virtual pbx) to route the calls, and setup voice mail and other features.
You could setup a linkux box, use asterisk, use on of the $25 pci cards that allow you to plug a pots line into it. Then use the spa (via SIP protocol) on the other end of the wireless unit.
Some things to be aware of is that if the SPA-2000 is behind nat you need to open udp ports 5060, 5061, 10000, and 16384. While others argue against this, I find it makes the sap unit very reliable.
For best qualy your going to use the ulaw codec 7.11 i think it’s called. but that uses the most bandwidth, and you will have some ability to send and recieve fax (but not all that reliable).
If you need to save bandwidth use g.726 flavor. I like to use g.726-40 (40 byte codec).
If you really need to save bandwidth and your not going to use fax use g.729 which is quite small at about 16k packets. But this costs a licence fee fo $10 not sure if this is one time or yearly though.
Regards,
Michael Perdue
Thanks Michael,
That’s really interesting - sounds like you are doing this “for real” and have thought through the problems.
Due to limited timescale I think I have to buy off-the-shelf products.
I’m sure your Linux box is the most powerful, but we don’t have time for this occasion.
For the CPE side, that’s easy - a VOIP adaptor such as Speedtouch 190.
But what to put the other side between the Mikrotik AP ethernet port and the POTs analogue line from the telco ?
Some advice would be appreciated -
Regards
where do you buy the cards necessary for the pots to linux or t1 to linux. i cant seem to find a reseller of the digium equipment?
Yes I am running a voip network across our a town wide mikrotik network. I am running 802.11a backbone and 802.11b to the customer side.
On the customer side I am running linksys 54gs routers re-flashed to svesoft firmware.
In the past I am running hotspot interface and when a client opens up there web browser they are prompted with user/pass (autenticated through radius)
For dedicated custoemrs I setup mangle (in the firewall section) to autenticate them via there mac address.
Recently i am converting everyoen over to pppoe (autentication throuh the ethernet prototol which also hooks into my radius box.)
The reason I am switching is that pppoe is much mroe secure, when a client turns there linksys 54gs routers on they autenticate THEN get an ip address.
Where as with hotspot and mac autnecating they get a dhcp ip address immedaly which gives them access to the local networkwork which potentually cause network issues/problems if they want to mess around.
The $25 pots card that plugs into a pci slot are available on e-bay. Just go to networking and search for asterisk pbx
My current depolyment of voip over the wireless network has been haulted due to the recent rulling that the FCC (here int he U.S.) has stated you must provide e911 services. My local e911 office is clueless how to interface to me and I them.
Regards,
Michael
Hi mperdue,
I also wish to pppoe and authenticate using my Vircom Radius, can you please help me on configuring MT to do this?
I’ve found that over our network g729 performs better than g711. This may be limited to the ZyXel WiFi VoIP phones we’re using. With g711 we were finding many quality problems, even on stable, idle links.