I have noticed some locked topics regarding the calling of 0800 not being able to connect I am having the same issue but not all 0800 numbers you should be able to see from my calling records. 0800 14 xnet works fine but very long waiting time to log a fault gave up waiting.
I see you are using a pap2t on openvfx, my first suggestion would be to use it as a certified device instead to avoid these kind of misconfiguration issues. There are a few things wrong, first of all your ata is trying to negotiate a bunch of codecs : m=audio 35452 RTP/AVP 18 0 2 4 8 96 97 98 100 101 a=rtpmap:18 G729a/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:2 G726-32/8000 a=rtpmap:4 G723/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:96 G726-40/8000 a=rtpmap:97 G726-24/8000 a=rtpmap:98 G726-16/8000 a=rtpmap:100 NSE/8000 a=fmtp:100 192-193 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15
I would suggest keeping it simple using this order :
1. G711a 2. G711u 3. G729
Second, your RTP packetization time (p-time) is set incorrectly you are sending us :
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