[OpenSIPS-Users] Multiple invite and bye for a single a call

[Bogdan-Andrei Iancu]

Hi,

The first duplicate INVITE is a a retransmission as the B party did not 
reply with anything back.

Now, the multiple 200 OK + ACK may be either because of network delays, 
either because the ACK is badly routed and never hits the UAS, so the 
UAS is retransmitting the 200 OK reply.

Is the BYE automatically generated by one of the devices or it is your 
actual hung up ?

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 07.09.2015 19:19, Aqs Younas wrote:
> Hi, users.
>
> I have two softphone register to opensips from same network. When I 
> call from one phone to another I see multiple invites and 200, bye for 
> a single call.
> Where is call sip trace.
>
> INVITE sip:14048002020 at 45.56.70.29:6060;transport=UDP SIP/2.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Max-Forwards: 70
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.7.30891 r30851
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 0 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8000 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
>
> SIP/2.0 100 Giving a try
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Server: OpenSIPS (1.11.3-notls (x86_64/linux))
> Content-Length: 0
>
> INVITE 
> sip:14048002020 at 182.176.103.109:34989;rinstance=f188b7fee3e3777f;transport=UDP 
> SIP/2.0
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Max-Forwards: 69
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.7.30891 r30851
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 0 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8000 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
> INVITE 
> sip:14048002020 at 182.176.103.109:34989;rinstance=f188b7fee3e3777f;transport=UDP 
> SIP/2.0
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Max-Forwards: 69
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.7.30891 r30851
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 0 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8000 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
>
> SIP/2.0 100 Trying
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Content-Length: 0
>
> SIP/2.0 100 Trying
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Content-Length: 0
>
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> User-Agent: Z 3.8.31438 r31441
> Content-Length: 0
>
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> User-Agent: Z 3.8.31438 r31441
> Content-Length: 0
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.8.31438 r31441
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 3 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8001 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.8.31438 r31441
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 3 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8001 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
> ACK sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---143ec2662caf0465
> Max-Forwards: 70
> Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 ACK
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> ACK sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.2
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---143ec2662caf0465
> Max-Forwards: 69
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 ACK
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.8.31438 r31441
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 3 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8001 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---409b5f11d8ba8af3
> Record-Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, 
> INFO, SUBSCRIBE
> Content-Type: application/sdp
> Supported: replaces, norefersub, extended-refer, timer, outbound, 
> path, X-cisco-serviceuri
> User-Agent: Z 3.8.31438 r31441
> Allow-Events: presence, kpml
> Content-Length: 245
>
> v=0
> o=Z 0 3 IN IP4 182.176.103.109
> s=Z
> c=IN IP4 182.176.103.109
> t=0 0
> m=audio 8001 RTP/AVP 3 110 8 0 97 101
> a=rtpmap:110 speex/8000
> a=rtpmap:97 iLBC/8000
> a=fmtp:97 mode=30
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=sendrecv
>
> ACK sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---143ec2662caf0465
> Max-Forwards: 70
> Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 ACK
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> ACK sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bK0b4b.4d77b6b1.2
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---143ec2662caf0465
> Max-Forwards: 69
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 1 ACK
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> BYE sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Max-Forwards: 70
> Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> BYE sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bKda4b.28b4b333.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Max-Forwards: 69
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 45.56.70.29:6060;branch=z9hG4bKda4b.28b4b333.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.8.31438 r31441
> Content-Length: 0
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.8.31438 r31441
> Content-Length: 0
>
> BYE sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989> SIP/2.0
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Max-Forwards: 70
> Route: <sip:45.56.70.29:6060;lr;ftag=8066dc24;did=974.5f8dfee6>
> Contact: <sip:14048002010 at 182.176.103.109:34512;transport=UDP>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.7.30891 r30851
> Content-Length: 0
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 182.176.103.109:34512;branch=z9hG4bK-524287-1---ef537d3eeab5a083
> Contact: <sip:14048002020 at 182.176.103.109:34989 
> <http://sip:14048002020@182.176.103.109:34989>>
> To: <sip:14048002020 at 45.56.70.29:6060;transport=UDP>;tag=ab2db826
> From: <sip:14048002010 at 45.56.70.29:6060;transport=UDP>;tag=8066dc24
> Call-ID: Xhj8khX7e_acyeCyrYIELw..
> CSeq: 2 BYE
> User-Agent: Z 3.8.31438 r31441
> Content-Length: 0
>
>
>
> Why there are unnecessary invite, 200 and bye being forward by opensisp?
>
>  t_check_trans() is used to stop duplicate requests.
>
> Best Regards.
>
>
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users

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