Jiri Kuthan writes:
MediaTrix might have some too, perhaps sightly cheaper, but they denied shipping to us as we are not in their interoperability club (which makes me cautios about their interoperability).
i bought one quite some time ago and they never fixed the sip bugs that i found it in, so i had to return the box and ask my money back. i don't know if the company or the product has become any better since then. also, the box had a noisy fan.
i would recommend cisco ata if two analog ports are enough. its sip implementation is the best what cisco has in any product and fixes have been prompt.
-- juha