T46S Speed dial problem

[chrischevy]

Strange problem here:

On a T46S with 66.84.0.10 firmware, I programmed a speeddial DSSKey with an external number. When I use it, I hear about one second of sound then the call becomes silent (but doesn't hangup).

If I dial the same number manually, everything is fine. I was able to reproduce the problem on 2 different systems (FreePBX) with 2 different T46s phones. For now, I only have one phone number that does this. It's probably related to the phone system of the person I'm calling, but the fact that everything is fine when not using the DSSKey speeddial is really strange.

Is there a difference between a speeddial and dialing a call manually ?

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Ok I just found out something while analysing a capture: the speeddial DSS Key adds ** after calling. When dialing manually, I don't see the **

The FreePBX log confirms this:
DTMF begin '*' received on SIP/206-000056f4
DTMF begin passthrough '*' on SIP/206-000056f4
DTMF end '*' received on SIP/206-000056f4, duration 100 ms
DTMF end accepted with begin '*' on SIP/206-000056f4
DTMF end passthrough '*' on SIP/206-000056f4
DTMF begin '*' received on SIP/206-000056f4
DTMF begin passthrough '*' on SIP/206-000056f4
DTMF end '*' received on SIP/206-000056f4, duration 100 ms
DTMF end accepted with begin '*' on SIP/206-000056f4
DTMF end passthrough '*' on SIP/206-000056f4