Hi ozerke,
I've also connected a Grandstream HT488 and IP Phone BT101/BT200 with a very good voice quality with most af Betamax label (voipcheap, voipbuster, voipbusterpro, voipstunt, ...) via voxalot server eu.voxalot.com
My voice codecs inside GT devices are very similar to yours: PCMU, PCMA, G723, G729, G726-32, iLBC.
Therefore, from the device configuration point of view the connection should be working fine.
Cheers
Paolo
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