Hi all Am experiencing a very weird behaviour with sip info DTMF . I have an * box which is a satellite hop away. When I make a call from a Grandstream call set to send DTMF thru sip info, am able to navigate through the * menus very well. meaning that the DTMF is being recieved very well. The problem is when I connect to an external sip server that has an IVR. The external sip server does not seem to recieve the DTMF from the GS phone. From an * server on the LAN connecting to the external sip server, the DTMF are recieved very well on the external server. I read something about the 250ms of the Sip INfo Mode of DTMF relay but its very shallow and have no idea on how to change the settings on Asterisk. http://www.voip-info.org/tiki-index.php?page=SIP%20Info%20DTMF Note: dtmf-relay or dtmf are not yet IANA registered application mime types Cisco uses SIP INFO for DTMF relay: See http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t11/ftinfo.htm Cisco equipment uses the following feature restrictions: -Minimum signal duration is 100 milliseconds (ms). If a request is received with a duration less than 100ms, the minimum duration of 100 ms is used by default. -Maximum signal duration is 5000 ms. If a request is received with a duration longer than 5000 ms, the maximum duration of 5000 ms is used by default. -If no duration parameter is included in a request, the gateway defaults to a signal duration of 250 ms. Can this be what is causing my problem ?