He's using the Linksys SPA2102 for BYOD. Voipo did not provide him with a Grandstream because he signed up back in Nov 2010 and got the old Linksys RT31P2 instead.
This RT31P2 model lacks strict DTMF controls (for talk-off issues), IP restriction (for DMZ), internal speed dials, etc. Plus, I made many other tweaks for him which are not allowed on provisioned ATA's (custom dial plans, etc) which made it better for him overall. Besides, he's got it hooked to his house wiring which back feeds all his phone ports. Grandstream products are notorious for FXS port failures with type of setup, whereas Linksys and OBI products typically are not.
The model of ATA is not the heart of the issue here, it's just the dependability of the BYOD SIP servers lately that have got him upset again. Most of our calls are Voipo-to-Voipo calls between us, when this doesn't even work I'm getting pretty peeved myself.
The only difference in our BYOD SIP and normal SIP servers are that the normal ones are in a closed environment that we control because only the devices we provision are on the normal ones.
Everything is the same besides the fact that on BYOD people can use whatever devices they want since they have their credentials with the exception of additional international restrictions.
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