Hello everybody, I really need some help here! I'm trying to use FS for making both inbound and outbound calls through Broadvox. Everything works perfectly except one particular situation with DTMF problem. In case of inbound calling (I'm calling FS), everything works fine. Call connects and I can send DTMF to FS and FS recognized those 100% (Testing with softphone from my desktop, SIP phone in the office, and all wireless carriers) However, I am having trouble with outbound calling. I have set it up to where FS makes an outbound call to certain number and once the call is answered, we start playing some custom IVR. Here, it works fine with softphone from my desktop, SIP phones in the office, AT&T, and Verizon. But for some reason FS will not recognize the DTMF coming from T-Mobile cell phones. Anyone has any idea? Below are my current setting from external.xml which was recommended by Broadvox. <param name="codec-prefs" value="PCMU,G729"/> <param name="dtmf-type" value="rfc2833"/> <param name="auto-rtp-bugs" value="clear"/> <param name="pass-rfc2833" value="true"/> <param name="inbound-late-negotiation" value="true"/> <param name="sip-trace" value="no"/> <param name="sip-capture" value="no"/> <param name="rfc2833-pt" value="101"/> <param name="sip-port" value="$${external_sip_port}"/> <param name="dialplan" value="XML"/> <param name="context" value="public"/> <param name="dtmf-duration" value="1000"/> <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/> <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/> <param name="hold-music" value="$${hold_music}"/> <param name="rtp-timer-name" value="soft"/> Best regards, Phil Kim The information contained in this e-mail message, and any attachment thereto, is the property of Valiant and is confidential and may not be disclosed without our express permission. If you are not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution or copying of this message, or any attachment thereto, in whole or in part, is strictly prohibited. If you have received this message in error, please immediately notify us by telephone, fax or e-mail and delete the message and all of its attachments. Thank you. Every effort is made to keep our network free from viruses. You should, however, review this e-mail message, as well as any attachment thereto, for viruses. We take no responsibility and have no liability for any computer virus which may be transferred via this e-mail message.