[exim] Issue non-standard command and capture codes returned…

I'm dealing with a Cisco T37 gateway that provides accounting
information within the SMTP session itself if you send "xact" before you
start the data section of an SMTP session.

Example:
> 220 mmoip-b.cisco.com Cisco NetWorks ESMTP server
> ehlo anyserver.com
> 250-mmoip-b.cisco.com, hello anyserver.com [223.255.254.10] (really)
> 250-ENHANCEDSTATUSCODES
> 250-8BITMIME
> 250-PIPELINING
> 250-HELP
> 250-DSN
> 250-XSESSION
> 250 XACCOUNTING
> mail from:<>
> 250 2.5.0 Sender <> ok
> rcpt to:<FAX=+1408555-7442@???>
> 250 2.1.5 Recipient <FAX=+1408555-7442@???> ok, maps to '5557442' (cp=yes)
> xact
> 250 2.5.0 XACCOUNTING enabled
> data
> 354 Enter mail, end with a single "."
> Testing 1 2 3
> Testing 1 2 3
> Testing 1 2 3
> Testing 1 2 3
> Testing 1 2 3
> Testing 1 2 3
> Testing 1 2 3
> .
> 250-2.5.0 Message delivered to remote fax machine
> 250-2.5.0 fax_modem_time = 32/41
> 250-2.5.0 fax_pages = 2
> 250-2.5.0 gateway_id = mmoip-b.cisco.com
> 250-2.5.0 fax_connect_speed = 14400bps
> 250-2.5.0 transmit_bytes = 16870
> 250-2.5.0 port_used = slot:1 port:2
> 250-2.5.0 call_type = Fax Send
> 250-2.5.0 abort_cause = 0
> 250-2.5.0 T30_error_code = 0
> 250-2.5.0 ISDN_disconnect_code = 16
> 250 2.5.0 CSID =555-7442

Is there any way for me to have exim issue the "xact" command and
capture the group of messages after the data section completes? So far
in perusing the Exim documentation, I haven't seen anything that
suggests I can, but I thought I'd ask.