Hi Has anybody had any problem with R11.1 IP 500, J159 & J169 DTMF on sip trunks. The sip provide can see no DTMF (RFC2833).
If you use the J159 & J169 internally to the voicemail pro it work fine.
I have an SE on the same version and that works with both phones internally and externally with the same sip provider
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