Fax to email

On 2.2 I am trying to set up fax to email and I have inbound route (using alaw and ulaw only) and whilst I can see the inbound fax call coming in and being processed, it seems that no temp files are created and no email is sent. Our fax machine thinks it is still waiting for a response and this is the live feed from the CLI

    -- Got SIP response 405 "Method Not Allowed" back from 192.168.0.98
    -- Executing NoOp("SIP/0001032365834-0829ba00", 
        "Received incoming SIP connection from unknown peer to 44xxxxxxxxxx")
        in new stack
    -- Executing Set("SIP/0001032365834-0829ba00", "DID=44xxxxxxxxxx")
        in new stack
    -- Executing Goto("SIP/0001032365834-0829ba00", "s|1") 
        in new stack
    -- Goto (from-sip-external,s,1)
    -- Executing Ringing("SIP/0001032365834-0829ba00", "") 
        in new stack
    -- Executing GotoIf("SIP/0001032365834-0829ba00", "1?from-trunk|44xxxxxxxxxx|1") 
        in new stack
    -- Goto (from-trunk,44xxxxxxxxxx,1)
    -- Executing Set("SIP/0001032365834-0829ba00", "FROM_DID=44xxxxxxxxxx") 
        in new stack
    -- Executing Gosub("SIP/0001032365834-0829ba00", "app-blacklist-check|s|1") 
        in new stack
    -- Executing LookupBlacklist("SIP/0001032365834-0829ba00", "") in new stack
    -- Executing GotoIf("SIP/0001032365834-0829ba00", "0?blacklisted") in new stack
    -- Executing Return("SIP/0001032365834-0829ba00", "") in new stack
    -- Executing Set("SIP/0001032365834-0829ba00", 
       "FAX_RX_EMAIL=s.turner@emailaddress.co.uk") in new stack
    -- Executing Answer("SIP/0001032365834-0829ba00", "") in new stack
    -- Executing PlayTones("SIP/0001032365834-0829ba00", "ring") in new stack
    -- Executing NVFaxDetect("SIP/0001032365834-0829ba00", "5") in new stack
    -- Executing Goto("SIP/0001032365834-0829ba00", "ext-fax|in_fax|1") in new stack
    -- Goto (ext-fax,in_fax,1)
    -- Executing StopPlayTones("SIP/0001032365834-0829ba00", "") in new stack
    -- Executing GotoIf("SIP/0001032365834-0829ba00", "1?3:analog_fax|1") in new stack
    -- Goto (ext-fax,in_fax,3)
    -- Executing Macro("SIP/0001032365834-0829ba00", "faxreceive") in new stack
    -- Executing Set("SIP/0001032365834-0829ba00", 
        "FAXFILE=/var/spool/asterisk/fax/1218542243.923.tif") in new stack
    -- Executing Set("SIP/0001032365834-0829ba00", 
       "EMAILADDR=s.turner@emailaddress.co.uk") in new stack
    -- Executing RxFAX("SIP/0001032365834-0829ba00", 
        "/var/spool/asterisk/fax/1218542243.923.tif") in new stack
    -- Executing System("SIP/0001032365834-0829ba00", 
       "/var/lib/asterisk/bin/fax-process.pl 
        --to <a href="mailto:s.turner@emailaddress.co.uk">s.turner@emailaddress.co.uk</a> --from
        <a href="mailto:s.turner@emailaddress.co.uk">s.turner@emailaddress.co.uk</a> --subject "Fax from 114xxxxxxx " 
        --attachment fax_114xxxxxxx.pdf --type application/pdf --file
         /var/spool/asterisk/fax/1218542243.923.tif") in new stack
    -- Executing Hangup("SIP/0001032365834-0829ba00", "") in new stack
  == Spawn extension (ext-fax, h, 2) exited non-zero on 'SIP/0001032365834-0829ba00'

Any pointers gratefully received :( Feel like I am so close...