Changing codec on Nokia E51

Does anybody know how I can select (limit) the codecs I use on a Nokia E51 connected to Voipfone?

I have the E51 connected by wifi to a router which is connected to a "fixed wireless" internet connection that has a download speed of 128kB (good enough) and an upload speed of 20-70kB/s (really marginal). This is in Mexico.

Amazingly it works well enough with low latency for calls to the UK. But obviously the uplink is a lower spec than a good codec needs, so the outward voice call quality varies a lot. I'm looking for a way to force a GSM or similar codec, either on the phone or within the voipfone account settings.

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