Hello. We use UAC for RGISTER some trunks

After fiew days normally work we have an issue that UAC not respond to 401 reply with WWW-Authenticate with reREGISTER with WWW. We have only 2 packets- REGISTR and 401.

IP 10.0.1.12.5068 > 1.2.3.4.5060: UDP, length 467 E.......@..F ...............REGISTER sip:provider.com SIP/2.0 Via: SIP/2.0/UDP my.service.com:5068;branch=z9hG4bKdb22.edd7eac5000000000000000000000000.0 To: sip:login@provider.com From: sip:login@provider.com;tag=6a39af2190f8b2c99cc63bfeb3a3959c-bfba CSeq: 10 REGISTER Call-ID: 5e171580088d170a-9952@10.0.1.12 Max-Forwards: 70 Content-Length: 0 User-Agent: kamailio (4.3.0-dev5 (x86_64/linux)) Contact: sip:login@my.service.com:5068 Expires: 360

IP 1.2.3.4.5060 > 10.0.1.12.5068: UDP, length 571 Q.......-. ........C.NSIP/2.0 401 Unauthorized Via: SIP/2.0/UDP my.service.com:5068;branch=z9hG4bKdb22.edd7eac5000000000000000000000000.0;received=23.100.24.250 From: sip:login@provider.com;tag=6a39af2190f8b2c99cc63bfeb3a3959c-bfba To: sip:login@provider.com;tag=as1550511c Call-ID: 5e171580088d170a-9952@10.0.1.12 CSeq: 10 REGISTER Server: FastTel SoftSwitch Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH Supported: replaces WWW-Authenticate: Digest algorithm=MD5, realm="provider.com", nonce="109104dc" Content-Length: 0

We have another trunk and reREGISTER is correctly

REGISTER sip:another_prov.com SIP/2.0 Via: SIP/2.0/UDP my.service.com:5068;branch=z9hG4bK7fd1.3d7c2fd7000000000000000000000000.0 To: sip:login_to_another_prov@another_prov.com From: sip:login_to_another_prov@another_prov.com;tag=6a39af2190f8b2c99cc63bfeb3a3959c-f8ba CSeq: 10 REGISTER Call-ID: 5e171580088d1edd-9952@10.0.1.12 Max-Forwards: 70 Content-Length: 0 User-Agent: kamailio (4.3.0-dev5 (x86_64/linux)) Contact: sip:login_to_another_prov@my.service.com:5068 Expires: 360

IP another_prov.com.5060 > 10.0.1.12.5068: UDP, length 544 E..<F...$. .6... ........(..SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP my.service.com:5068;branch=z9hG4bK7fd1.3d7c2fd7000000000000000000000000.0;rport=5068;received=23.100.28.126 To: sip:login_to_another_prov@another_prov.com;tag=04e2a294d0728b89107e081a19babab4.d569 From: sip:login_to_another_prov@another_prov.com;tag=6a39af2190f8b2c99cc63bfeb3a3959c-f8ba CSeq: 10 REGISTER Call-ID: 5e171580088d1edd-9952@10.0.1.12 WWW-Authenticate: Digest realm="another_prov.com", nonce="VTifD1U4neNLMSYRoxNlOpD7hPSu3ET3" Server: kamailio (4.2.1 (x86_64/linux)) Content-Length: 0

IP 10.0.1.12.5068 > another_prov.com.5060: UDP, length 690 E...uT..@... ...6...........REGISTER sip:another_prov.com SIP/2.0 Via: SIP/2.0/UDP my.service.com:5068;branch=z9hG4bK8fd1.ea73d070000000000000000000000000.0 To: sip:login_to_another_prov@another_prov.com From: sip:login_to_another_prov@another_prov.com;tag=6a39af2190f8b2c99cc63bfeb3a3959c-f8ba CSeq: 11 REGISTER Call-ID: 5e171580088d1edd-9952@10.0.1.12 Max-Forwards: 70 Content-Length: 0 User-Agent: kamailio (4.3.0-dev5 (x86_64/linux)) Contact: sip:login_to_another_prov@my.service.com:5068 Expires: 360 Authorization: Digest username="login_to_another_prov", realm="another_prov.com", nonce="VTifD1U4neNLMSYRoxNlOpD7hPSu3ET3", uri="sip:another_prov.com", response="2ee14a437173700e88056279b854749f", algorithm=MD5

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