Hello Andreas,

just to confirm - so its probably not related to the commit that was shared 
previously about the change in the PV module?

Cheers,

Henning 

> -----Original Message-----
> From: Andreas Heil via sr-users <[email protected]>
> Sent: Mittwoch, 4. Februar 2026 14:30
> To: Kamailio (SER) - Users Mailing List <[email protected]>
> Cc: Andreas Heil <[email protected]>
> Subject: [SR-Users] Re: [EXT] Possible bug introduced in 5.8.5
> 
> 
> 
> > Am 04.02.2026 um 14:12 schrieb Ihor Olkhovskyi via sr-users <sr-
> [email protected]>:
> >
> > Can you please share the initial packet? Cause leading space is also 
> > something
> I've seen before.
> > And what is restore mode?
> >
> > modparam("uac","restore_mode","???“)
> 
> What’s interesting is:
> The leading space only appears if I use the remove_hf/append_hf approach.
> It doesn’t appear if I use uac_replace_to.
> 
> The restore_mode is left on default (auto).
> 
> Initial packet:
> — snip —
> INVITE sip:[email protected]:5060 SIP/2.0
> Via: SIP/2.0/UDP 1.2.3.4:5060;branch=z9hG4bK-95136-1-3;origin=2.3.4.5
> Max-Forwards: 69
> Contact: <sip:[email protected]:5060;transport=udp>
> To: sip:[email protected]:5060
> From: <sip:[email protected]:5060>;tag=95136SIPpTag001
> Call-ID: [email protected]
> CSeq: 2 INVITE
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY,
> REFER, INFO, MESSAGE, UPDATE
> Proxy-Authorization: Digest
> username="+4923456789012",realm="example.com",uri="sip:3.4.5.6:5060",nonc
> e="fjlsdflcjm",response="rbcwnhfdmd",algorithm=MD5
> Content-Type: application/sdp
> Supported: replaces, timer
> User-Agent: Mitel XY
> P-Preferred-Identity: <sip:[email protected]:5060>
> Content-Length:   252
> X-CID: [email protected]
> Route: <sip:[email protected]:5060;lr>
> 
> v=0
> o=- 2178418001 27164738186117121 IN IP4 1.2.3.4
> s=-
> c=IN IP4 1.2.3.4
> t=0 0
> m=audio 6000 RTP/AVP 8 0 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=fmtp:18 annexb=no
> a=rtpmap:101 telephone-event/8000
> a=sendrecv
> a=ptime:20
> — snap —
> 
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