Maybe it is time to look at ZTE traces/logs.

P.S.
Try to check in docs meaning of X-ZTE-Cause

On 08/27/2018 04:06 PM, Mojtaba wrote:
Hi, I knew, But i have not access to ZTE's pcscf.
Thank you. 
But what about my question?Why the UE could not register via SEMS?


On Mon, 27 Aug 2018 15:40 Ivailo Dobrev, <ivailod@telera.eu> wrote:
Hello,

It's not directly related to your question but keep in mind that SBC
should be put after vendor's/ZTE p-cscf if possible. Otherwise you will
have QoS issues (if Rx is enabled/used) because of rewritten SDP from
SBC/B2BUA.

Regards,
Ivo

On 08/27/2018 08:06 AM, Mojtaba wrote:
> Hello,
> I am working with IMS (ZTE vendor), I want to use SBC in front of IMS
> network for some security policy (Hide Topology),
> I used SEMS as SBC in this regards, (like what  we have in IMS/SEMS in
> kamailio by Mr Carsten Bock).
> When the Sebscriber want to register, The Register request received by
> sems and the forward to IMS(ZTE), But the "503 Service Unavailable" is
> received from IMS.
> I enable "enable_reg_caching=yes" in register.sbcprofile''s
> configuration file in sems.
> If i use kamailio, instead of SEMS, The Registration request is done
> successfully.In Kamailio i just forward the Register request to
> IMS.like this:
> route {
> if (is_method("REGISTER")) {
>                  $du = "sip:172.23.1.1:5080";
>                  route(RELAY);
> }
> }
> Let me know do the issue is from myself or from IMS(ZTE)?
> In the fillowing, I paste all SIP Register signalling. First in
> kamailio, second with SEMS.
> ================Kamailio==================
>      172.23.1.252.4080 > 172.23.1.1.5080: [bad udp cksum 0x5e58 ->
> 0x4193!] UDP, length 787
> E../....@.]...............^XREGISTER sip:r-kh.com SIP/2.0
> Via: SIP/2.0/UDP
> 172.23.1.252:4080;branch=z9hG4bK018b.e091260b1b7395975a2ff1be0b9bec60.0
> Via: SIP/2.0/UDP
> 192.168.122.1:64407;branch=z9hG4bK-d8754z-7c208b9d587de818-1---d8754z-
> Max-Forwards: 69
> Contact: <sip:+985137054518@192.168.122.1:64407;rinstance=e664e178fc12691e;transport=UDP>
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5aef0541
> Call-ID: ZWYxMzUzNTQzN2I2MTRiMjE2NWZjMzUzMDFmMDhkOWY.
> CSeq: 1 REGISTER
> Expires: 3600
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Allow-Events: presence, kpml
> Content-Length: 0
>
>
> 08:20:53.114198 IP (tos 0x0, ttl 255, id 25839, offset 0, flags
> [none], proto UDP (17), length 685)
>      172.23.1.1.5080 > 172.23.1.252.4080: [udp sum ok] UDP, length 657
> E...d......$..............l.SIP/2.0 401 Unauthorized
> Via: SIP/2.0/UDP
> 172.23.1.252:4080;branch=z9hG4bK018b.e091260b1b7395975a2ff1be0b9bec60.0
> Via: SIP/2.0/UDP
> 192.168.122.1:64407;branch=z9hG4bK-d8754z-7c208b9d587de818-1---d8754z-
> To: <sip:+985137054518@r-kh.com;transport=UDP>;tag=ztesipTR9m3KdZ*3-5-16648*daei.3
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5aef0541
> Call-ID: ZWYxMzUzNTQzN2I2MTRiMjE2NWZjMzUzMDFmMDhkOWY.
> CSeq: 1 REGISTER
> Content-Length: 0
> WWW-Authenticate: Digest
> realm="r-kh.com",domain="sip:scscf1.r-kh.com",nonce="f42b36e39bdbb33b51599924b304445a",opaque="aW1zLmNvbS5jbg==",stale=TRUE,algorithm=MD5,qop="auth"
>
>
> 08:20:53.120142 IP (tos 0x10, ttl 64, id 48874, offset 0, flags
> [none], proto UDP (17), length 1137)
>      172.23.1.252.4080 > 172.23.1.1.5080: [bad udp cksum 0x5f9a ->
> 0xcc62!] UDP, length 1109
> E..q....@.\V.............]_.REGISTER sip:r-kh.com SIP/2.0
> Via: SIP/2.0/UDP
> 172.23.1.252:4080;branch=z9hG4bKd08b.4d2858f41d496b471c01a28e76190390.0
> Via: SIP/2.0/UDP
> 192.168.122.1:64407;branch=z9hG4bK-d8754z-a4d19146375d56f6-1---d8754z-
> Max-Forwards: 69
> Contact: <sip:+985137054518@192.168.122.1:64407;rinstance=e664e178fc12691e;transport=UDP>
> To: <sip:+985137054518@r-kh.com;transport=UDP>
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5aef0541
> Call-ID: ZWYxMzUzNTQzN2I2MTRiMjE2NWZjMzUzMDFmMDhkOWY.
> CSeq: 2 REGISTER
> Expires: 3600
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Authorization: Digest
> username="+985137054518@r-kh.com",realm="r-kh.com",nonce="f42b36e39bdbb33b51599924b304445a",uri="sip:r-kh.com;transport=UDP",response="9469852a06c01efeabf3a7a5dd1a9f3b",cnonce="79d36600575648a1cc7221d8e1b5d53d",nc=00000001,qop=auth,algorithm=MD5,opaque="aW1zLmNvbS5jbg=="
> Allow-Events: presence, kpml
> Content-Length: 0
>
>
> 08:20:53.203871 IP (tos 0x0, ttl 255, id 25842, offset 0, flags
> [none], proto UDP (17), length 1118)
>      172.23.1.1.5080 > 172.23.1.252.4080: [udp sum ok] UDP, length 1090
> E..^d......p.............J.5SIP/2.0 200 OK
> Via: SIP/2.0/UDP
> 172.23.1.252:4080;branch=z9hG4bKd08b.4d2858f41d496b471c01a28e76190390.0
> Via: SIP/2.0/UDP
> 192.168.122.1:64407;branch=z9hG4bK-d8754z-a4d19146375d56f6-1---d8754z-
> To: <sip:+985137054518@r-kh.com;transport=UDP>;tag=ztesipjRydzgMa*3-5-16648*daej.3
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5aef0541
> Call-ID: ZWYxMzUzNTQzN2I2MTRiMjE2NWZjMzUzMDFmMDhkOWY.
> CSeq: 2 REGISTER
> Contact: <sip:+985137054518@192.168.122.1:64407;transport=UDP;rinstance=e664e178fc12691e>;expires=1800
> Contact: <sip:ZTEAGCF000f425704be720000@agcf2.r-kh.com:5079;appid=2-7;UserRegInfo=002-02-00-0b80-04-172.30.48.143;BACaddr=172.30.48.143;BACport=2944>;expires=1800;+sip.instance="<urn:uuid:172.30.35.41-000>";reg-id=1
> P-Associated-URI: <tel:+985137054518>
> P-Associated-URI: <sip:+985137054518@r-kh.com>
> Date: Sat, 25 Aug 2018 12:25:17 GMT
> Authentication-Info:
> nextnonce="00cfbd64b136c12a4e27b67fd28d19fb",qop=auth,rspauth="91ca956c5eb6ee9f1934e2e770750077",cnonce="79d36600575648a1cc7221d8e1b5d53d",nc=00000001
> Content-Length: 0
> ============================SEMS========================
>      172.23.1.252.5080 > 172.23.1.1.5080: [bad udp cksum 0x5e16 ->
> 0xe11e!] UDP, length 721
> E...C.@.@.................^.
>
> REGISTER sip:r-kh.com SIP/2.0
> Via: SIP/2.0/UDP 172.23.1.252:5080;branch=z9hG4bK~0uk0ahN;rport
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=34384541-5B814A44000AE296-4B5F5700
> To: <sip:+985137054518@r-kh.com;transport=UDP>
> CSeq: 10 REGISTER
> Call-ID: 37B52BC0-5B814A44000AE592-4B5F5700
> Route: <sip:172.23.1.1:5080;lr>
> Max-Forwards: 70
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Allow-Events: presence, kpml
> Contact: <sip:+985137054518@192.168.122.1:64407;rinstance=868560f8328d39e9;transport=UDP>;expires=3600
> Content-Length: 0
>
>
> 08:23:32.790414 IP (tos 0x0, ttl 255, id 35790, offset 0, flags
> [none], proto UDP (17), length 593)
>      172.23.1.1.5080 > 172.23.1.252.5080: [udp sum ok] UDP, length 565
> E..Q.....................=..SIP/2.0 401 Unauthorized
> Via: SIP/2.0/UDP 172.23.1.252:5080;rport=5080;branch=z9hG4bK~0uk0ahN
> To: <sip:+985137054518@r-kh.com;transport=UDP>;tag=ztesipDEmH2AWT*3-5-16648*egei.3
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=34384541-5B814A44000AE296-4B5F5700
> Call-ID: 37B52BC0-5B814A44000AE592-4B5F5700
> CSeq: 10 REGISTER
> Content-Length: 0
> WWW-Authenticate: Digest
> realm="r-kh.com",domain="sip:scscf1.r-kh.com",nonce="179797f920a09d65b5641e5e87df0d8c",opaque="aW1zLmNvbS5jbg==",stale=TRUE,algorithm=MD5,qop="auth"
>
>
> 08:23:32.855067 IP (tos 0x0, ttl 64, id 17364, offset 0, flags [DF],
> proto UDP (17), length 1071)
>      172.23.1.252.5080 > 172.23.1.1.5080: [bad udp cksum 0x5f58 ->
> 0xf553!] UDP, length 1043
> E../C.@.@................._X
>
> REGISTER sip:r-kh.com SIP/2.0
> Via: SIP/2.0/UDP 172.23.1.252:5080;branch=z9hG4bKeAfKkaZa;rport
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5A64C27D-5B814A44000CD034-4B6F6700
> To: <sip:+985137054518@r-kh.com;transport=UDP>
> CSeq: 10 REGISTER
> Call-ID: 5380C97E-5B814A44000CD2A5-4B6F6700
> Route: <sip:172.23.1.1:5080;lr>
> Max-Forwards: 70
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Authorization: Digest
> username="+985137054518@r-kh.com",realm="r-kh.com",nonce="179797f920a09d65b5641e5e87df0d8c",uri="sip:r-kh.com;transport=UDP",response="017efb986e17506a82bb01e8eb136b90",cnonce="3764fd5eb2ea9539d61ec14196a2bf00",nc=00000001,qop=auth,algorithm=MD5,opaque="aW1zLmNvbS5jbg=="
> Allow-Events: presence, kpml
> Contact: <sip:+985137054518@192.168.122.1:64407;rinstance=868560f8328d39e9;transport=UDP>;expires=3600
> Content-Length: 0
>
>
> 08:23:32.860417 IP (tos 0x0, ttl 255, id 35804, offset 0, flags
> [none], proto UDP (17), length 508)
>      172.23.1.1.5080 > 172.23.1.252.5080: [udp sum ok] UDP, length 480
> E...........................SIP/2.0 503 Service Unavailable
> Via: SIP/2.0/UDP 172.23.1.252:5080;rport=5080;branch=z9hG4bKeAfKkaZa
> To: <sip:+985137054518@r-kh.com;transport=UDP>;tag=ztesipxxsD3FR2VG8e9zxR_1dx*1-1-16648*ihad.1
> From: <sip:+985137054518@r-kh.com;transport=UDP>;tag=5A64C27D-5B814A44000CD034-4B6F6700
> Call-ID: 5380C97E-5B814A44000CD2A5-4B6F6700
> CSeq: 10 REGISTER
> X-ZTE-Cause: "CSCF-1.1.BC004016-BC004288-0-0.pcscf1.r-kh.com"
> Retry-After: 30
> Content-Length: 0
>
>
>
>


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