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CFwdALL failing when forwarding an IP 7940 to a t-mobile cell phone.

We are having issues forwarding our IP phones to a T-mobile cell phone. Other cell carriers i.e. Sprint, Verizon and MetroPCS work fine. The calls forwarded to T-mobile will sometimes connect and the caller will get dead air. If you dial the IP phone's internal extension it works but if you dial the 10 digit number i.e. off network it fails. Any suggestions?                 

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CFwdALL failing when forwarding an IP 7940 to a t-mobile cell ph

Maybe a codec issue?

We had a problem recently when setting up a new SIP trunk for PSTN connectivity. Some cell providers connected fine others would fail.

Could you give more information around your setup?

Regards

Matty

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