That's perfect, with a SIP trace we have something to work from rather than having to go back and forwards.
Your call from sipgate is going through to voipcheap and there it is getting rejected with a response of 400 Bad Request. I checked a call to voipcheap (this time I just used my voipstunt details instead of signing up for yet another Betamax account and they worked which was great) and the call got through fine. This means that there is no SIP interoperability issue between voipcheap and mss.
I suspect your problem is that the "number" you are trying to dial at voipcheap is iporter, i.e. sip:firstname.lastname@example.org. That doesn't look right to me. Are you trying to forward your call to a PSTN number through voipcheap? If so your dialplan command should be of the form.
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