A question for the more technologically aware:

Does degradation occur when a Sprint customer (CDMA) calls a T-Mobile
customer (GSM) due to the nature of the compression algorithms used in
the two technologies?

My assumptions:

* A Sprint-to-Sprint call will always be best, even if one phone has
marginal consumer ratings, because the call never leaves the Sprint

* Sprint-to-landline would be next best because there would only be
the Sprint-side compression.

* Sprint-to-Verizon could be a problem, especially if the call has to
be routed through the domestic long distance telephone system -
compression at both ends, but still CDMA-based.

* Sprint-to-GSM would be least good because of the general
incompatibilities of the transmission systems, plus all of the other
variables mentioned above.

I recognize that wireless telephony is pretty darn close to rocket
science and we take it for granted more often than not. If anybody
else (Rob/Os?) could jump in on this or elaborate in ways I've missed,
please feel free so I can learn a bit more.

Thanks in advance.

See More: Quality of Service within standards and between standards