[mgream]

I have an Asterisk (CVS head) setup with an SPA3000 (2.0.13(GWg)), using the SPA to manage FXO and FXS ports for BT PSTN and an internal DECT phone. I'm also setting up Asterisk for SIP, IAX2 and other VOIP configuration, but that's not relevant here.

The scenario is that I have an incoming PSTN call (e.g. my mobile), that bounces from SPA to Asterisk, and Asterisk sends it to the DECT handset, which I answer. This works fine: call is connected, audio path okay, etc.

If I hang up PSTN call (i.e. my mobile), then SPA detects the disconnect, forwards to Asterisk, which clears down the call properly. I noticed that there's a common problem with SPA not detecting PSTN disconnect: that's not a problem for me!

The problem I have is in that scenario if I hang up the handset: Asterisk tells SPA that the call is terminated, and SPA clears down the PSTN line. Unfortunately, SPA doesn't do that properly, and the PSTN call is still connected. So, for example, if I make a new outgoing call, the previously connected party (i.e. my mobile!) hears the SPA dial DTMF digits.

The syslog output from SPA when it thinks that it is clearing down the PSTN looks okay to me:

Jun 19 15:30:25 gate-telephony AUD:Stop PSTN Tone
Jun 19 15:30:25 gate-telephony [1:0]AUD Rel Call
Jun 19 15:30:25 gate-telephony AUD:Stop PSTN Tone
Jun 19 15:30:25 gate-telephony AUD:Stop PSTN Tone
Jun 19 15:30:25 gate-telephony FXO:Stop CNDD
Jun 19 15:30:25 gate-telephony AUD:Stop PSTN Tone

I looked in the FAQ, searched the forums, but cannot see that anyone else has had this problem. Are there any suggestions? If it makes a difference, I am on an unbundled London exchange, my DSL service is provided by Bulldog so I'm not sure whether that means anything for how my line is terminated inside the exchange.

Thanks in advance for your help.