Asterisk IVR does not recognise SPA8800 caller interactions

I have successfully integrated a SPA8800 into our Asterisk system. Now we can dial-out and dial-in via the PSTN connected to the SPA8800 and into Asterisk. The problem however is when the call is presented the Asterisk IVR where the caller is expected to press either extension numbers or numeric options — Asterisk does not recognise the pressed keys and the IVR just continue playing. All other calls via the SIP trunks are processed correctly when the caller interacts with the IVR.
Please help.

There are several methods to pass DTMF thru SIP channel (in-band, out-of-band/SIP_INFO, AVT). You need to configure SPA8800 according to Asterisk requirements (or vice versa).
Also note that in-band signalling doesn't work well trougth compressed codecs like G.729. You need to use uncompressed codecs like G.711 for it.

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