INVITE sip:FIJOVOIP@188.127.XXX.YYY:5060 SIP/2.0
Via: SIP/2.0/UDP 212.230.ZZZ.ZZZ:5060;branch=z9hG4bK-*8*eb5360ebbba336342a55taN0
To: <tel:+34952NNNNNN>
From: <sip:6XXXXXXXX@212.230.ZZZ.ZZZ>;tag=ztesipE9TLMzm79Qb*5-12-20481*dcch.5
Call-ID: ZusOG7mBTNvP93hCmIM0FjicIh3VCvDE3ax4kKQim12jhei@zteims
CSeq: 1000 INVITE
Max-Forwards: 63
Contact: <sip:6XXXXXXXX@212.230.ZZZ.ZZZ:5060;b_p=DIAG_8_0_081b5b6e;zte-did=5-12-20481-1120-12-553-65535>
Supported: timer
P-Early-Media: supported
Session-Expires: 1800;refresher=uac
Min-SE: 90
P-Asserted-Identity: <tel:6XXXXXXXX>
User-Agent: ZTE Softswitch/1.0.0
Privacy: none
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,INFO,REFER,NOTIFY,SUBSCRIBE,UPDATE
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 135

v=0
o=ZTE 320 1198408459 IN IP4 212.230.ZZZ.ZZY
s=phone-call
c=IN IP4 212.230.ZZZ.ZZY
t=0 0
m=audio 39712 RTP/AVP 8 0 18
a=ptime:20

SIP/2.0 416 Unsupported URI Scheme
Via: SIP/2.0/UDP 212.230.ZZZ.ZZZ:5060;received=212.230.ZZZ.ZZZ;branch=z9hG4bK-*8*eb5360ebbba336342a55taN0
Call-ID: ZusOG7mBTNvP93hCmIM0FjicIh3VCvDE3ax4kKQim12jhei@zteims
From: <sip:6XXXXXXXX@212.230.ZZZ.ZZZ>;tag=ztesipE9TLMzm79Qb*5-12-20481*dcch.5
To: <tel:+34952NNNNNN>;tag=z9hG4bK-*8*eb5360ebbba336342a55taN0
CSeq: 1000 INVITE
Server: ZXHN F680/V2.0.10P2T4
Content-Length:  0


ACK sip:FIJOVOIP@188.127.XXX.YYY:5060 SIP/2.0
Via: SIP/2.0/UDP 212.230.ZZZ.ZZZ:5060;branch=z9hG4bK-*8*eb5360ebbba336342a55taN0
To: <tel:+34952NNNNNN>;tag=z9hG4bK-*8*eb5360ebbba336342a55taN0
From: <sip:6XXXXXXXX@212.230.ZZZ.ZZZ>;tag=ztesipE9TLMzm79Qb*5-12-20481*dcch.5
Call-ID: ZusOG7mBTNvP93hCmIM0FjicIh3VCvDE3ax4kKQim12jhei@zteims
CSeq: 1000 ACK
Max-Forwards: 70
User-Agent: ZTE-B200
Content-Length: 0

The traces with the error:

[2018-02-25 22:03:55] DEBUG[22322] pjproject:           sip_endpoint.c Processing incoming message: Request msg INVITE/cseq=1000 (rdata0x7f9bf401c1c8)
[2018-02-25 22:03:55] DEBUG[22322] netsock2.c: Splitting '212.230.ZZZ.ZZZ:5060' into...
[2018-02-25 22:03:55] DEBUG[22322] netsock2.c: ...host '212.230.ZZZ.ZZZ' and port '5060'.
[2018-02-25 22:03:55] DEBUG[22322] netsock2.c: Splitting '192.168.1.50:5060' into...
[2018-02-25 22:03:55] DEBUG[22322] netsock2.c: ...host '192.168.1.50' and port '5060'.
[2018-02-25 22:03:55] DEBUG[22322] pjproject:                 endpoint .Response msg 416/INVITE/cseq=1000 (tdta0x7f9bf000e248) created
[2018-02-25 22:03:55] DEBUG[22322] pjproject:            sip_resolve.c .Target '212.230.ZZZ.ZZZ:5060' type=UDP resolved to '212.230.ZZZ.ZZZ:5060' type=UDP (UDP transport)

Configuration pjsip.conf files

[AOR_DFT](!)
type = aor
qualify_frequency=15
qualify_timeout=5.0
authenticate_qualify=yes
remove_existing=yes
max_contacts=1

[AOR_TRUNK_DFT](!,AOR_DFT)
type = aor
qualify_timeout=3

[FIJOVOIP]
type=registration
outbound_auth=FIJOVOIP
outbound_proxy=sip:imsmad.dominio.com\;lr
contact_user=FIJOVOIP
server_uri=sip:ims.dominio.com
client_uri=sip:+34952NNNNNN@ims.dominio.com
retry_interval=1800

[FIJOVOIP]
type=auth
realm=ims.dominio.com
auth_type=userpass
username=+34952NNNNNN@ims.dominio.com
password=CLAVE

[FIJOVOIP](AOR_TRUNK_DFT)
contact=sip:ims.dominio.com
outbound_proxy=sip:imsmad.dominio.com\;lr


[FIJOVOIP]
type=endpoint
context=from-pstn
message_context=sms
outbound_auth=FIJOVOIP
aors=FIJOVOIP
disallow=all
allow=G729,ulaw,alaw
from_user=+34952NNNNNN
from_domain=ims.dominio.com
outbound_proxy=sip:imsmad.dominio.com\;lr
language=es
dtmf_mode=rfc4733
device_state_busy_at=1
allow_subscribe=yes
sub_min_expiry=30
rtp_symmetric=yes
direct_media=no
disable_direct_media_on_nat=yes
ice_support=yes
force_rport=yes

[FIJOVOIP]
type=identify
endpoint=FIJOVOIP
match=imsmad.dominio.com