asterisk users - Jul 2006 - wip-300 question on audio dial out with tdm2402e

I have a wip-300 linksys phone, tdm2402e and a number of uniden phones.
When I call wip-300 to any internal phone it sounds just fine.
When I call outside on the tdm2402e board it is not clear. the other 
person does not hear
anything odd but I hear drops in the audio.

When I call out with a uniden phone I dont hear any drops in audio.

The linksys wip-300 is using the same codec g711u as the uniden phone.

Why would I be hearing audio drop outs on the wip-300?