[Users] ACK transaction

Hello, I'd like to relay sip calls from openserto another sip proxy (asterisk), and i have a problem with radius accounting, i 'd like to report acks, but openser doesn't send accounting packet on it. As i understand ack requests must match a transaction flaged to accounting. Config look like this, so i think all transaction is flaged. modparam("acc", "report_ack", 1) modparam("acc", "radius_flag", 1) modparam("acc", "radius_missed_flag", 2) route{ ... setflag(1); setflag(2); ... } Asterisk retransmit the 200 ok, so i think there is something mistake in the ack. as i read in rfc 3261, ACK must match the dialog, callid, from, to, fromtag, to, tag, and sequence number is relevant. and ack on a 200 ok, is always a new transaction, however i see branch parameter is 0 in the ack, it must start with the magic cookie z9hG4..., isn't it? I dont understand what could be the problem, why 200 ok is retransmitted, and why not openser send acctpacket to radius. Please someone take a look at the sip messages openser->asterisk INVITE sip:0619997400@127.0.0.1:5061 SIP/2.0 Record-Route: <sip:217.116.32.20;lr=on;ftag=LAWYzDCZnyMjZxIp> Via: SIP/2.0/UDP 217.116.32.20;branch=z9hG4bKde6a.a93de1c7.0 Via: SIP/2.0/UDP 192.168.1.150:1720;received=217.116.36.22;branch=z9hG4bKvDD2OX3SfnAE6cR5;rport=1720 Max-Forwards: 69 User-Agent: PA168S V1.53.006 CFG0 From: "222" <sip:222@siptest>;tag=LAWYzDCZnyMjZxIp To: "0619997400" <sip:0619997400@siptest> Call-ID: x3Gd6ZKUB9IeRuPO(a)192.168.1.150 Contact: <sip:222@217.116.36.2:1720> CSeq: 2 INVITE Supported: replaces Content-Type: application/sdp Content-Length: 275 [sdp] asterisk->openser SIP/2.0 200 OK Via: SIP/2.0/UDP 217.116.32.20;branch=z9hG4bKde6a.a93de1c7.0;received=217.116.32.20 Via: SIP/2.0/UDP 192.168.1.150:1720;received=217.116.36.2;branch=z9hG4bKvDD2OX3SfnAE6cR5;rport=1720 Record-Route: <sip:217.116.32.20;lr=on;ftag=LAWYzDCZnyMjZxIp> From: "222" <sip:222@siptest>;tag=LAWYzDCZnyMjZxIp To: "0619997400" <sip:0619997400@siptest>;tag=as37b57c9f Call-ID: x3Gd6ZKUB9IeRuPO(a)192.168.1.150 CSeq: 2 INVITE User-Agent: eWorld Com Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Contact: <sip:0619997400@217.116.32.20:5061> Content-Type: application/sdp Content-Length: 206 [sdp] openser->asterisk <-- SIP read from 217.116.32.20:5060: ACK sip:0619997400@127.0.0.1:5061 SIP/2.0 Record-Route: <sip:217.116.32.20;lr=on;ftag=LAWYzDCZnyMjZxIp> Via: SIP/2.0/UDP 217.116.32.20;branch=0 Via: SIP/2.0/UDP 192.168.1.150:1720;received=217.116.36.2;branch=z9hG4bKKysauOpwGdpnsmlS;rport=1720 Route: <sip:217.116.32.20;lr=on;ftag=LAWYzDCZnyMjZxIp> Max-Forwards: 69 User-Agent: PA168S V1.53.006 CFG0 From: "222" <sip:222@siptest>;tag=LAWYzDCZnyMjZxIp To: "0619997400" <sip:0619997400@siptest>;tag=as37b57c9f Call-ID: x3Gd6ZKUB9IeRuPO(a)192.168.1.150 Contact: <sip:222@217.116.36.2:1720> Authorization: Digest username="222", realm="siptest", nonce="45dea111f92e1d1f9bf408a3996413168c304ee9", uri="sip:0619997400@217.116.32.20:5061", response="50419464515ca2771ec4b2bde7147219", algorithm=MD5 CSeq: 2 ACK Content-Length: 0 Thanks any help, Tamas