Weird issue yealink t18p dialing vendor IVR

aromero69

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Hi Everyone,
I needed some cheap phones to implement pbxiaf and I found the t18p for $50. Everything is working fine except for one weird thing:
When my users dial certain vendors that use an ivr/autoattendant, the numbers pressed are not recognized. For example press 1 for english 2 for spanish, my user presses 2 and nothing happens. It seems that the tone is awfully short. Anyone ran into that before? I have linksys spa941 phones and that works great. It also works fine on a softphone. It only happens with a handful of vendors. I have changed or verified the following settings on the phone itself:
Phone>tone> set to united states (I believe this controls the frequency of the tone)
Phone>features>General Information>Key As Send>disabled (this feature allows the phone to retain any numbers pressed after the call is made and send them only after the user presses #).
Thanks
 
Check out the settings for DTMF.

Personally, I have dtmfmode=auto in my SIP Trunk configuration with voip.ms with no issues, but you may want to experiment with inband, rdc2833, or info to see if it helps care for your issues.

As a final note, my phones (Aastra 57i has the following settings:
Force RFC2833 Out of Band DTMF = Enabled
DTMF Method = RTP
 

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