HI to all

I am facing o problem with ZAIN (formerly Celtel) in Gabon.
Having installed a GSM gateway on our PABX, it is impossible to make
incoming call, because the DTMF tones aren't passed to the PABX from the
GSM link.

If I insert a SIM card from a different operator in the gateway,
everything becomes OK.

Is there a parameter in the network subscriber's database that can
restrict transmission of DTMF tones?

The infrastructure is Ericsson.

See More: DTMF transparency