Having problem when dialling DTMF over SIP. I ring external number who has auto attendant (the remote is not a yeastar system) I get options press 1, 2 etc. On pressing digits nothing happens.
I have listened to the call and there is no DTMF tone on the call.
I have made calls from SIp deskphone, Linkus App on Iphone and Linkus app on laptop.
I also tried changing the DTMF options for the trunk.
I then registered the SIP trunk to a different system (not yeastar) made the same call and that worked ok