I figured out the issue. It is Topos Module that does this problem. Without Topos enabled everything works fine. The Kamailio version we have on all nodes is 5.3.8 and the config for topos is this. modparam("topos", "db_url", DBURL) modparam("topos", "mask_callid", 0) modparam("topos", "sanity_checks", 0) modparam("topos", "branch_expire", 130) # 3 Min modparam("topos", "dialog_expire", 10800) # 3 Hours modparam("topos", "clean_interval", 60) modparam("topos", "event_mode", 3) modparam("topos", "contact_host", "sip.myservice.com") Is there something wrong in this config or it is a bug/limitation on Topos Module? Kind regards, Angelo Hi, > Does it look like a NAT issue of the UAC? If so, why only on incoming > calls and not the opposite? > > Regards, > Angelo > > >> Hi, >> >> I am having a problem with some inbound calls that all have the below >> behavior. >> My setup has: Carrier(UDP) -> (UDP)Kamailio1(UDP) -> (UDP)Kamailio2(TLS) >> -> (TLS)UAC >> Kamailio1 has Topos Module. UAC is behind NAT with LAN IP 192.168.1.105 >> and Public 200.200.200.30 >> Carrier IP 50.50.50.19, Kamailio1 IP 100.100.100.243, Kamailio2 IP >> 100.100.100.210 >> The Carrier sends in a new call and the call is answered from the UAC >> with 200 OK SDP. >> Carrier sends ACK and it looks like it reaches the UAC but, UAC still >> resends several times 200 OK and carrier sends server ACK that arrives or >> not ??? to UAC until finally UAC sends a BYE. >> On the SIP flow you can see that Kamailio2 sends the ACK to >> 192.168.1.105 and not to 200.200.200.30. Is this ok?? >> Another thing to mention is that Kamailio2 that has the UAC connected >> via TLS, can be used fine from the UAC to make an outbound call following >> the reverse path, but on the inbound we have the below. >> Any help will be much appreciated, >> >> ACK from Kamailio2 100.100.100.210 to UAC >> Session Initiation Protocol (ACK) >> Request-Line: ACK sip:btpsh-f3-6153392a-5fa-5@192.168.1.105:5061;transport=TLS >> SIP/2.0 >> Message Header >> Via: SIP/2.0/TLS 100.100.100.210:5061 >> ;branch=z9hG4bKfc5f.67a77810bcdafe811ea3672a027450d8.0 >> Via: SIP/2.0/UDP >> 100.100.100.243;rport=5060;branch=z9hG4bKfc5f.e2b515e9c8c33d2bd05682f26df24e39.0 >> Call-ID: >> isbcaqhye0rozjgeghorzav1vtytoqztkheq(a)B.5.108.ims.forthnet.gr >> [Generated Call-ID: >> isbcaqhye0rozjgeghorzav1vtytoqztkheq(a)B.5.108.ims.incarrier.com] >> From: <sip:987654321@ims.carrier.com >> ;user=phone>;tag=ZZ58CDf_CZ.Yj2U5 >> To: <sip:23456789@ims.carrier.com >> ;user=phone>;tag=0120779a-edf4-464a-9c43-2ddf54459083 >> CSeq: 1 ACK >> Max-Forwards: 64 >> Request-Disposition: no-fork >> Content-Length: 0 >> Contact: <sip:btpsh-f3-6153392a-5fa-5@100.100.100.243> >> >> >> |Time | 50.50.50.19 | 100.100.100.210 >> | 192.168.1.105 | >> | | | 100.100.100.243 | | >> 200.200.200.30 | >> |0.000000 | INVITE SDP (g711A te | | >> | |SIP INVITE From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> >> Call-ID:isbcaqhye0rozjgeghorzav1vtytoqztkheq@B.5.108.ims.incarrier.gr >> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |0.001737 | 100 trying -- your c | | >> | |SIP Status 100 trying -- your call >> is important to us >> | |(5060) <------------------ (5060) | | >> | | >> |0.074622 | | INVITE SDP (g711A te | >> | |SIP INVITE From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |0.074797 | | INVITE SDP (g711A te | >> | |SIP INVITE From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |0.081110 | | 100 trying -- your c | >> | |SIP Status 100 trying -- your call >> is important to us >> | | |(5060) <------------------ (5060) | >> | | >> |0.082070 | | 100 trying -- your c | >> | |SIP Status 100 trying -- your call >> is important to us >> | | |(5060) <------------------ (5060) | >> | | >> |0.082833 | | | INVITE SDP >> (g711A te | |SIP INVITE From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> ------------------> (37275) | | >> |0.163871 | | | 100 Trying| >> | |SIP Status 100 Trying >> | | | |(5061) >> <------------------ (37275) | | >> |0.447621 | | | 180 Ringing >> | |SIP Status 180 Ringing >> | | | |(5061) >> <------------------ (37275) | | >> |0.448004 | | 180 Ringing | >> | |SIP Status 180 Ringing >> | | |(5060) <------------------ (5060) | >> | | >> |0.448765 | | 180 Ringing | >> | |SIP Status 180 Ringing >> | | |(5060) <------------------ (5060) | >> | | >> |0.465033 | 180 Ringing | | >> | |SIP Status 180 Ringing >> | |(5060) <------------------ (5060) | | >> | | >> |2.529599 | | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |2.733556 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |2.734596 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |2.864311 | 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |3.024789 | | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |3.025005 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |3.025854 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |3.034979 | 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |3.106784 | ACK | | | >> | |SIP Request INVITE ACK 200 CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |3.126287 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |3.126542 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |3.145821 | | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |4.025449 | | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |4.025743 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |4.026548 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |4.033198 | 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |4.094832 | ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |4.102992 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |4.103316 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |4.106301 | | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |6.025167 | | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |6.025543 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |6.026377 | | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |6.034778 | 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |6.096896 | ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |6.104675 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |6.104910 | | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |6.108907 | | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |10.024538| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |10.024866| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |10.025750| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |10.033461| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |10.095387| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |10.102265| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |10.102449| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |10.105760| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |14.025310| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |14.025585| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |14.026528| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |14.037027| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |14.099479| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |14.111540| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |14.111708| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |14.116089| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |18.025311| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |18.025659| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |18.026572| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |18.034736| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |18.096101| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |18.106560| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |18.106687| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |18.111007| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |22.024673| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |22.024953| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |22.026120| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |22.033514| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |22.095104| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |22.105921| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |22.106043| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |22.110298| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |26.031501| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |26.031903| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |26.033136| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |26.040343| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |26.101967| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |26.111938| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |26.112432| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |26.118306| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |30.035446| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |30.035693| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |30.036501| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |30.044170| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |30.106395| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |30.116960| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |30.117412| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |30.129913| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |34.026492| | | 200 OK SDP >> (g711A) | |SIP Status 200 OK >> | | | |(5061) >> <------------------ (37275) | | >> |34.026807| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |34.027775| | 200 OK SDP (g711A) | >> | |SIP Status 200 OK >> | | |(5060) <------------------ (5060) | >> | | >> |34.035453| 200 OK SDP (g711A) | | >> | |SIP Status 200 OK >> | |(5060) <------------------ (5060) | | >> | | >> |34.097385| ACK | | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | |(5060) ------------------> (5060) | | >> | | >> |34.106319| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |34.106681| | ACK | | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | |(5060) ------------------> (5060) | >> | | >> |34.110714| | | ACK | >> | |SIP ACK From: < >> sip:987654321@ims.carrier.com;user=phone> To:< >> sip:123456789@ims.carrier.com;user=phone> CSeq:1 >> | | | |(5061) >> --------------------------------------> (5061) | >> |34.526688| | | BYE | >> | |SIP Request BYE CSeq:15322 >> | | | |(5061) >> <------------------ (37275) | | >> |34.528722| | BYE | | >> | |SIP Request BYE CSeq:15322 >> | | |(5060) <------------------ (5060) | >> | | >> |34.529704| | BYE | | >> | |SIP Request BYE CSeq:15322 >> | | |(5060) <------------------ (5060) | >> | | >> |34.668418| BYE | | | >> | |SIP Request BYE CSeq:15322 >> | |(5060) <------------------ (5060) | | >> | | >> |34.788963| 200 OK | | | >> | |SIP Status 200 OK >> | |(5060) ------------------> (5060) | | >> | | >> |34.796051| | 200 OK | | >> | |SIP Status 200 OK >> | | |(5060) ------------------> (5060) | >> | | >> |34.796205| | 200 OK | | >> | |SIP Status 200 OK >> | | |(5060) ------------------> (5060) | >> | | >> |34.796604| | | 200 OK | >> | |SIP Status 200 OK >> | | | |(5061) >> ------------------> (37275) | | >> >> >> Kind regards, >> Angelo >> >