Hi all, I would like to know whether it's possible to put one of the SPA525G2 hand sets behind one SRP527W at a remote site that can then connect to the main office's UC520W which will also be put behind an SRP527W, or do I have to use a pair of SR520s to achieve this result? The customer has baulked at the cost of the SR520 and is looking for a more cost-effective option (their words, not mine)