> Am 04.02.2026 um 14:12 schrieb Ihor Olkhovskyi via sr-users 
> <[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",nonce="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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