It would be advisable to set the ports on 5060 and 5062.
Should not be a problem for either provider.
Also set to use different RTP ports (Eg 5004, 5008).
Are you using a STUN server set-up? Which one if yes?
My suggestion would be to put Voxalot on Account 1, and use stun.voxalot.com:3478
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