Yes, that it possible. If you do not include h323-sig in the outbound dial peer it should not negotiate that parameter. Remember that a dial-peer specific command will overrule the global setting (in the 'voice service voip, h323' global config section)
you can check with 'show call active voice | inc tmf'
Thanks for your feeback, but actually this is not what happens with our H.323 gateway (IOS 5300 Software (C5300-IK8S-M), Version 12.2(15)T14)
Whether we have h245-alpha or h245-signal on the dial peer configuration or not does not influence the gateway behavior: it always sends both the signal and alpha in the H.245 TCS (terminal capability set).
To my knowledge, there is no global setting to suppress the support of either alphanumeric or signal DTMF exchange mode, like there is for the in-band nte mode (with the h245 caps suppress nte command).
Are you aware of any fix that would have improved this behavior on a more recent release, and if so could you please provide its reference ?
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