[Serusers] ser-0.9 Bug with BYE messages/Record-Route not being honored??

Java Rockx javarockx at yahoo.com
Fri Jan 21 18:49:00 CET 2005 

Hi All.

I think I've identified a bug with how ser-0.9 handles BYE messages. It seems that ser-0.9 is not
honoring Record-Route headers when sending BYE messages.

Below is a complete SIP conversation between my GrandStream BT100 phone and a PSTN phone. We use a
3rd party for PSTN access and they utilize a Sonus box for SIP-to-TDM and a seperate SIP proxy. 

The actual problem is this; when a SIP phone hangs up **FIRST** the BYE message is sent to their
Sonus Box directly rather than to their SIP proxy. Their Sonus box is listed as the "Contact"
field in the SDP of the INVITE. The original INVITE was Record-Routed so shouldn't the BYE be sent
to this IP rather than to the other end-point directly?

When the phones go off-hook, our PSTN provider sends us a 200 OK which we ACK correctly, but then
the BYE is wrong.

Can anyone look at this conversation and tell me why the BYE is sent to 216.229.118.76 rather than
216.229.127.60?

Regards,
Paul

IP LEGEND
---------------------------------------------------
68.84.100.10 - PUBLIC SIDE OF MY LAN FIREWALL
68.84.199.18 - IP ADDRESS OF MY SER SIP PROXY
216.229.127.60 - IP ADDRESS OF 3RD PARTY SIP PROXY
216.229.118.76 - IP ADDRESS OF 3RD PARTY SONUS BOX


U 2005/01/21 11:38:14.259621 68.84.100.10:63689 -> 68.84.199.18:5060
INVITE sip:3219392336 at mycompany.com;user=phone SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK67f005c3c771821e.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>.
Contact: <sip:3212514231 at 192.168.0.83:63689;user=phone>.
Supported: replaces.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27735 INVITE.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 70.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Type: application/sdp.
Content-Length: 411.
.
v=0.
o=3212514231 0 8000 IN IP4 192.168.0.83.
s=SIP Call.
c=IN IP4 192.168.0.83.
t=0 0.
m=audio 39738 RTP/AVP 98 18 4 15 2 9 0 8 101.
a=sendrecv.
a=rtpmap:98 iLBC/8000.
a=fmtp:98 mode=20.
a=rtpmap:18 G729/8000.
a=rtpmap:4 G723/8000.
a=rtpmap:15 G728/8000.
a=rtpmap:2 G726-32/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=ptime:40.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-11.
 
#
U 2005/01/21 11:38:14.264900 68.84.199.18:5060 -> 68.84.100.10:63689
SIP/2.0 407 Proxy Authentication Required.
Via: SIP/2.0/UDP
192.168.0.83:63689;branch=z9hG4bK67f005c3c771821e;rport=63689;received=68.84.100.10.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=bf952ed189d8425c881b09485aa0b6f1.954a.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27735 INVITE.
Proxy-Authenticate: Digest realm="mycompany.com",
nonce="41f13122784651d60bfa0cd3d5778587c1105f35".
Server: Sip eXpress Router (0.9.0 (i386/linux)).
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:14.270933 68.84.100.10:63689 -> 68.84.199.18:5060
ACK sip:3219392336 at mycompany.com;user=phone SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK67f005c3c771821e.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=bf952ed189d8425c881b09485aa0b6f1.954a.
Contact: <sip:3212514231 at 192.168.0.83:63689;user=phone>.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27735 ACK.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 70.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:14.288516 68.84.100.10:63689 -> 68.84.199.18:5060
INVITE sip:3219392336 at mycompany.com;user=phone SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK7779e54c00e334a6.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>.
Contact: <sip:3212514231 at 192.168.0.83:63689;user=phone>.
Supported: replaces.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at mycompany.com;user=phone", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="2463041979c1bb36367b0d9d06bfa966".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 70.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Type: application/sdp.
Content-Length: 411.
.
v=0.
o=3212514231 1 8000 IN IP4 192.168.0.83.
s=SIP Call.
c=IN IP4 192.168.0.83.
t=0 0.
m=audio 39738 RTP/AVP 98 18 4 15 2 9 0 8 101.
a=sendrecv.
a=rtpmap:98 iLBC/8000.
a=fmtp:98 mode=20.
a=rtpmap:18 G729/8000.
a=rtpmap:4 G723/8000.
a=rtpmap:15 G728/8000.
a=rtpmap:2 G726-32/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=ptime:40.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-11.
 
#
U 2005/01/21 11:38:14.304423 68.84.199.18:5060 -> 68.84.100.10:63689
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP
192.168.0.83:63689;branch=z9hG4bK7779e54c00e334a6;rport=63689;received=68.84.100.10.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Server: Sip eXpress Router (0.9.0 (i386/linux)).
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:14.304581 68.84.199.18:5060 -> 216.229.127.60:5060
INVITE sip:3219392336 at 216.229.127.60;user=phone SIP/2.0.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKd55a.8a20c236.0.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>.
Contact: <sip:3212514231 at 68.84.100.10:63689;user=phone>.
Supported: replaces.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at mycompany.com;user=phone", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="2463041979c1bb36367b0d9d06bfa966".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 16.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Type: application/sdp.
Content-Length: 412.
.
v=0.
o=3212514231 1 8000 IN IP4 192.168.0.83.
s=SIP Call.
c=IN IP4 68.84.199.18.
t=0 0.
m=audio 36096 RTP/AVP 98 18 4 15 2 9 0 8 101.
a=sendrecv.
a=rtpmap:98 iLBC/8000.
a=fmtp:98 mode=20.
a=rtpmap:18 G729/8000.
a=rtpmap:4 G723/8000.
a=rtpmap:15 G728/8000.
a=rtpmap:2 G726-32/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=ptime:40.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-11.
 
#
U 2005/01/21 11:38:14.370297 216.229.127.60:5060 -> 68.84.199.18:5060
SIP/2.0 100 Try.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKd55a.8a20c236.0.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
To: <sip:3219392336 at mycompany.com;user=phone>.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Supported: replaces.
Proxy-Authorization: Digest username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at mycompany.com;user=phone", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="2463041979c1bb36367b0d9d06bfa966".
User-Agent: Grandstream BT100 1.0.5.16 .
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, INFO, SUBSCRIBE.
Content-Type: application/sdp.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:15.561196 216.229.127.60:5060 -> 68.84.199.18:5060
SIP/2.0 180 Ringing.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKd55a.8a20c236.0.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Contact: sip:3219392336 at 216.229.118.76:4060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Content-Length: 249.
.
v=0.
o=Sonus_UAC 31122 22717 IN IP4 216.229.118.76.
s=SIP Media Capabilities.
c=IN IP4 216.229.118.100.
t=0 0.
m=audio 14202 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=sendrecv.
 
#
U 2005/01/21 11:38:15.565333 68.84.199.18:5060 -> 68.84.100.10:63689
SIP/2.0 180 Ringing.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Contact: sip:3219392336 at 216.229.118.76:4060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Content-Length: 247.
.
v=0.
o=Sonus_UAC 31122 22717 IN IP4 216.229.118.76.
s=SIP Media Capabilities.
c=IN IP4 68.84.199.18.
t=0 0.
m=audio 36096 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=sendrecv.
 
##
U 2005/01/21 11:38:20.788205 216.229.127.60:5060 -> 68.84.199.18:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKd55a.8a20c236.0.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Contact: sip:3219392336 at 216.229.118.76:4060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Accept: multipart/mixed, application/sdp, application/isup, application/dtmf,
application/dtmf-relay.
Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
Supported: timer.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Session-Expires: 240;refresher=uas.
Content-Length: 249.
.
v=0.
o=Sonus_UAC 31122 22717 IN IP4 216.229.118.76.
s=SIP Media Capabilities.
c=IN IP4 216.229.118.100.
t=0 0.
m=audio 14202 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=sendrecv.
 
#
U 2005/01/21 11:38:20.791744 68.84.199.18:5060 -> 68.84.100.10:63689
SIP/2.0 200 OK.
Via: SIP/2.0/UDP
192.168.0.83:63689;rport=63689;received=68.84.100.10;branch=z9hG4bK7779e54c00e334a6.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 INVITE.
Contact: sip:3219392336 at 216.229.118.76:4060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Accept: multipart/mixed, application/sdp, application/isup, application/dtmf,
application/dtmf-relay.
Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
Supported: timer.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Session-Expires: 240;refresher=uas.
Content-Length: 247.
.
v=0.
o=Sonus_UAC 31122 22717 IN IP4 216.229.118.76.
s=SIP Media Capabilities.
c=IN IP4 68.84.199.18.
t=0 0.
m=audio 36096 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=sendrecv.
 
#
U 2005/01/21 11:38:20.815426 68.84.100.10:63689 -> 68.84.199.18:5060
ACK sip:3219392336 at 216.229.118.76:4060 SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bKe4c4477775398df9.
Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Route: <sip:216.229.127.60:5060;lr>.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Contact: <sip:3212514231 at 192.168.0.83:63689;user=phone>.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at 216.229.118.76:4060", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="4160207afa0e806b3e1050a73ca1a852".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 ACK.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 70.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:20.816100 68.84.199.18:5060 -> 216.229.127.60:5060
ACK sip:3219392336 at 216.229.118.76:4060 SIP/2.0.
Record-Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Via: SIP/2.0/UDP 68.84.199.18;branch=0.
Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.100.10;branch=z9hG4bKe4c4477775398df9.
Route: <sip:216.229.127.60:5060;lr>.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Contact: <sip:3212514231 at 192.168.0.83:63689;user=phone>.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at 216.229.118.76:4060", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="4160207afa0e806b3e1050a73ca1a852".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27736 ACK.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 16.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Length: 0.
.
 
#####################
U 2005/01/21 11:38:31.289799 68.84.100.10:63689 -> 68.84.199.18:5060
BYE sip:3219392336 at 216.229.118.76:4060 SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK41337bf509b31050.
Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Route: <sip:216.229.127.60:5060;lr>.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at 216.229.118.76:4060", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="85f6afb2964895599d68eac1f6812fb5".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27737 BYE.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 70.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:31.293894 68.84.199.18:5060 -> 216.229.118.76:4060
BYE sip:3219392336 at 216.229.118.76:4060 SIP/2.0.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKe55a.7940d157.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.100.10;branch=z9hG4bK41337bf509b31050.
Route: <sip:68.84.199.18;ftag=2440ace3b188639c;lr=on>.
Route: <sip:216.229.127.60:5060;lr>.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5,
uri="sip:3219392336 at 216.229.118.76:4060", nonce="41f13122784651d60bfa0cd3d5778587c1105f35",
response="85f6afb2964895599d68eac1f6812fb5".
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27737 BYE.
User-Agent: Grandstream BT100 1.0.5.16.
Max-Forwards: 16.
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:31.364179 216.229.118.76:4060 -> 68.84.199.18:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 68.84.199.18;branch=z9hG4bKe55a.7940d157.0.
Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.100.10;branch=z9hG4bK41337bf509b31050.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27737 BYE.
Content-Length: 0.
.
 
#
U 2005/01/21 11:38:31.364640 68.84.199.18:5060 -> 68.84.100.10:63689
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.100.10;branch=z9hG4bK41337bf509b31050.
From: "Paul Hazlett" <sip:3212514231 at mycompany.com;user=phone>;tag=2440ace3b188639c.
To: <sip:3219392336 at mycompany.com;user=phone>;tag=0ceeba5a.
Call-ID: 870d0fdeaa2f0d0f at 192.168.0.83.
CSeq: 27737 BYE.
Content-Length: 0.
.



		
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