I got problem with dtmf RFC2833 in interconnecting with Nextone using SIP.
Nextone----------------->AS5300XM (acting as IPIP GW)------------>AS5400-------E1------->PSTN
When Nextone call in and press 103 to reach extention at my staff, my cisco AS5300XM send back OK message but when Signal-Update from SIP INFO msg my cisco AS5300XM send back Bad Request (SIP 400 msg).
Detail of debug ccsip message in my cisco as in attached file.
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