You'll need to provide the CODEC that you are using in X-Lite!
The codec used in Xlite is 711uLaw. I guess it is one of the preferred ones other than gsm. And it is of small size.
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David Kwok
FWD#/IAXTEL# : 17001813482 ext 1002
smime.p7s
Description: S/MIME Cryptographic Signature