27 Nov
2012
27 Nov
'12
4:38 p.m.
I'm trying to get the MWI indicator on endpoints to work by redirecting the
SUBSCRIBE to the voicemail server (asterisk) using usc_replace_(to|from).
This works fine for the initial request but the next subscribe will fail since
the to/from don't get rewritten, which is indicated by the error:
ERROR: uac [replace.c:250]: decline FROM replacing in sequential request in
auto mode (has TO tag)
This occurs when the modparam "uac","restore_mode" is manual or auto.
When set
to none the redirect will be correct but all responses have to be rewritten
manually (I'm a beginner and I don't want to do this just yet). And since uac
has knowledge about this having being rewritten, sending the original from/to
looks like like a bug to me (more probable a misconfiguration/omission of
something crucial withing dialog responses :)
Changes to the (default debian package) config, in route
route[PRESENCE] in if(is_method("SUBSCRIBE"))
if( is_method("SUBSCRIBE"))
{
if(search_hf("Event", "message-summary", "a"))
{
if (!www_authenticate("$fd", "subscriber")) {
www_challenge("$fd", "1");
exit;
}
if(avp_db_query("SELECT value FROM usr_preferences WHERE username='$au'
and attribute='voicemail' ORDER BY value limit 1"))
{
$avp(voicemail)=$avp(i:1);
$avp(subscrfrom)=$fu;
avp_subst("$avp(subscrfrom)",
"/sip:.*@/sip:$avp(voicemail)@/");
uac_replace_from("$avp(subscrfrom)");
uac_replace_to("","sip:$avp(voicemail)@$sel(cfg_get.voicemail.srv_ip):
$sel(cfg_get.voicemail.srv_port)");
remove_hf("Authorization");
$ru = "sip:" + $avp(voicemail) + "@" +
$sel(cfg_get.voicemail.srv_ip) +
":" + $sel(cfg_get.voicemail.srv_port);
route(RELAY);
}
}
else
{
handle_subscribe();
t_release();
}
}
exit;
192.168.34.226 is the sip device, 192.168.32.40 kamailio, 192.168.32.41 the
voicemailserver.
Initial request:
U 192.168.34.226:5852 -> 192.168.32.40:5060
SUBSCRIBE sip:grandstream@sip.local SIP/2.0.
From: "Daniel" <sip:grandstream@sip.local>;tag=67d8f67065827fe2.
To: <sip:grandstream@sip.local>.
Gets rewritten to:
U 192.168.32.40:5060 -> 192.168.32.41:5060
SUBSCRIBE sip:0880100782@192.168.32.41:5060 SIP/2.0.
From: "Daniel" <sip:0880100782@sip.local>;tag=67d8f67065827fe2.
To: <sip:0880100782@192.168.32.41:5060>.
The response gets relayed to the endpoint and MWI will light up since there is
a message.
But next subscribe update from the endpoint triggers the "decline FROM
replacing in sequential request" error and thus the subscribe send to
voicemail is the original to/from:
U 192.168.32.40:5060 -> 192.168.32.41:5060
SUBSCRIBE sip:0880100782@192.168.32.41:5060 SIP/2.0.
From: "Daniel" <sip:grandstream@sip.local>;tag=67d8f67065827fe2.
To: <sip:grandstream@sip.local>;tag=as324de8f3.
Resulting in a 404 since the to/from are not the real peername on the
voicemail server. How do I force Kamailio to rewrite the from/to without doing
this manually for a requests/responses (restore_mode none)? The easy way out
of this problem would be to have a 1 to 1 relation for the Kamailio
subscribers and voicemail peers. But uac_replace should work (somehow).
Attached is a full capture of the subscribe/notify. Running 3.3.2+squeeze from
http://deb.kamailio.org/kamailio/. Machine is also running topoh module
(192.168.0.1).
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