issue with auto attendant for incoming calls from PSTN

[HusseinLTD]

Hi all, 

I'n new in the collaboration area, so please bare with me.

I have CME 11.5 installed on 4331 router, I have configured the auto attendant and it's working perfectly when testing from inside the network, but when I call from outside (PSTN) I hear the welcome message but I can't enter any extension, like when it says press 1 for sales or 0 for help, it doesn't matter what I choose, I keep pressing 1 and 0 but it's not redirecting me, it just keep reading the message and repeating it.

remember, this issue is only when call is coming from outside, when I test it from another ip phone it works normally.

I'm not sure if it's related to transcoding (that I have no experience about it)

show run file is attached

thank you

[Mohamed Amine Jaafar]

Since the autoattendant works correctly internally the issue is around DTMF negotiation from the SIP Trunk side.

Please attach a debug of the external call with the following debugs :

debug voip rtp session named-event

debug ccsip messages