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New Member

High density analog FXO gateway


What is the best voice gateway that is capable of supporting 30 FXO ports on the same chassis (if such a device exists).

I just read the NM-HDA network module supports up to 8 FXO ports so I will need 4 of these modules if this is the only option available.

It is needed to connect 30 tellular devices to the VoIP network.

Thanks for your advice.


Re: High density analog FXO gateway

Considering the high cost of the HDAs and a router to handle 4 of them I would opt for 2 channel banks connected to T1 CAS ports set for FXO signalling.

Here's a channel bank that would work:

Please rate helpful posts.

Re: High density analog FXO gateway

Cost is a very big issue. I would suggest going with what dgahm suggested.

If you use a 3845 which has 4 NM slots and put 4 NM-HDAs, each NM-HDA can home 8 FXO lines. So the max you will get is 32 FXO ports. I have not tested this configuration, so I am not sure if 4 modules will work perfectly with out any issues on a 3845. Considering the cost of a 3845 plus 4 NM-HDA modules, plus 2 daughter cards per NM-HDA and also a DSP chip required per network module...sounds like a lot of money for 30 FXO port solution.


PS: Please remember to rate helpful replies!

New Member

Re: High density analog FXO gateway

Yes, the HDA option seems very expensive, so I will consider the Channel Bank option.

Thanks a lot for your replies.


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