[SR-Users] is $td.did avp a normal avp?

[Juha Heinanen]

domain module sets $td.did at lookup_domain call.  $td.did seems to be a
normal avp, because i can print its value with xlog by referring to it
as $avp(td.did).  however, its value is gone at failure route, which
makes me suspect that $td.did is not really a normal avp.

in route block i have

    $avp(did) = $td.did;
    xlog("L_INFO", "at t_relay: <td/td.did> = <$avp(did)/$avp(td.did)>\n");
    if (t_relay()) exit;

branch route, onreply route, and failure route are set when the above
t_relay() takes place.

at the end of branch route block, i have

    xlog("L_INFO", "at end of contact branches: <did/td.did> = <$avp(did)/$avp(td.did)>\n");

and at the beginning of onreply route block:

    xlog("L_INFO", "at beginning of onreply: <did/td.did> = <$avp(did)/$avp(td.did)>\n");

and at the beginning of failure route block:

    xlog("L_INFO", "at beginning of contact failure: <did/td.did = <$avp(did)/$avp(td.did)>\n");

when i make a call, i get to syslog:

Apr 22 15:53:27 sip /usr/sbin/sip-proxy[13706]: INFO: at t_relay: <td/td.did> = <test.fi/test.fi>
Apr 22 15:53:27 sip /usr/sbin/sip-proxy[13706]: INFO: at end of contact branches: <did/td.did> = <test.fi/test.fi>
Apr 22 15:53:27 sip /usr/sbin/sip-proxy[13708]: INFO: at beginning of onreply: <did/td.did> = <test.fi/<null>>
Apr 22 15:53:27 sip /usr/sbin/sip-proxy[13705]: INFO: at beginning of contact failure: <did/td.did = <test.fi/<null>>

why is it that $avp(did) value has been preserved from route/branch
route block to onreply/failure blocks, but value of $avp(td.did) is not?

i'll cc to jan in case he is not on this list.

-- juha