[OpenSIPS-Users] Using remove_hf/insert_hf leads to garbage in SIP message

[nick at uni-petrol.com]

Dear All! 

I need to replace Contact header receiving from UAC to
new one. 

I have strange problem with all Yealink phones. 

When I use
remove_hf/insert_hf in onreply route opensips didn't proper strip
header. 

My config: 

onreply_route[1]
{


if(is_present_hf("Contact"))
 {
 if(remove_hf("Contact"))
 {

insert_hf("Contact: rn", "From");
 }
 else
 {
 xlog("L_ERR", "Error
removing Contact header: M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci UA=$ua
CT=$ct TO=$tUn");
 }
 }

}

As you can see from trace below opensips
proper remove Contact header, but leave "sip:username at UAC-WAN-IP:1197"
before "Content-Type: application/sdp"

SIP/2.0 200 OK
Via: SIP/2.0/TCP
SIP-UPLINK-GW-IP:5092;received=SIP-UPLINK-GW-IP;branch=z9hG4bK-d8754z-cf461413f8f8b92e-1---d8754z-;rport=35007
Record-Route:

Record-Route: 
Contact: 
From: "1234567" ;tag=ff571748
To:
;tag=193729847
Call-ID:
NzkxZjNjNzUxNjVhMGZkMjZkZDY5M2RkNTk2NWE1ODU.
CSeq: 1
INVITE
sip:username at UAC-WAN-IP:1197Content-Type: application/sdp
Allow:
INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER,
SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
User-Agent: Yealink SIP-T20P
9.60.14.8
Content-Length: 203

v=0
o=- 20000 20000 IN IP4
UAC-LAN-IP
s=SDP data
c=IN IP4 192.168.30.4
t=0 0
m=audio 17264 RTP/AVP
8 96
a=rtpmap:8 PCMA/8000
a=fmtp:96 0-15
a=rtpmap:96
telephone-event/8000
a=sdpmangled:yes

Trace without Contact
manipulations:

SIP/2.0 200 OK
Via: SIP/2.0/TCP
SIP-UPLINK-GW-IP:5092;received=SIP-UPLINK-GW-IP;branch=z9hG4bK-d8754z-37e3024aff94374c-1---d8754z-;rport=35030
Record-Route:

Record-Route: 
From: "1234567" ;tag=71ab6c06
To:
;tag=1956700973
Call-ID:
NzliOWI0OTAzYjk0NmIwZDM4ZWFkZDI4Yjg5NWUxNjQ.
CSeq: 1 INVITE
Contact:

Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE,
CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE,
MESSAGE
User-Agent: Yealink SIP-T20P 9.60.14.8
Content-Length:
203

v=0
o=- 20001 20001 IN IP4 UAC-LAN-IP
s=SDP data
c=IN IP4
192.168.30.4
t=0 0
m=audio 17188 RTP/AVP 8 96
a=rtpmap:8
PCMA/8000
a=fmtp:96 0-15
a=rtpmap:96
telephone-event/8000
a=sdpmangled:yes

Please help.

Thanks in
advance!

  
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