Thank you, miconda. We don't set r-uri value in pcscf.cfg, icscf.cfg or scscf.cfg. I will show more details below using the logs with Jitsi. I will omit SDP to save space.

1. When PCSCF received the Sip Invite from caller, the Sip headers look fine:

INVITE sip:bob@ims.mnc001.mcc001.3gppnetwork.org SIP/2.0
Call-ID: 0b23b2ee62c061ae9f3cc1569b7824b3@0:0:0:0:0:0:0:0
CSeq: 1 INVITE
From: "alice" sip:alice@ims.mnc001.mcc001.3gppnetwork.org;tag=94b2833a
To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org
Via: SIP/2.0/UDP [fc00🔢3:1:0:0:0:0]:5060;branch=z9hG4bK-393032-567b1c47371a83386f685807100ab5bd
Max-Forwards: 70
Contact: "alice" sip:alice@[fc00🔢3:1:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org
User-Agent: Jitsi2.10.5550Linux
Content-Type: application/sdp
Content-Length: 910

2. Then PCSCF sent it to SCSCF:

INVITE sip:bob@ims.mnc001.mcc001.3gppnetwork.org SIP/2.0
Route: sip:orig@scscf.ims.mnc001.mcc001.3gppnetwork.org:5060;lr
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:45];lr=on;ftag=94b2833a;nat=yes;did=991.9181
Call-ID: 0b23b2ee62c061ae9f3cc1569b7824b3@0:0:0:0:0:0:0:0
CSeq: 1 INVITE
From: "alice" sip:alice@ims.mnc001.mcc001.3gppnetwork.org;tag=94b2833a
To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:45];branch=z9hG4bK0d1b.9247221bd3cd63299ff9b3e1486a94e0.0
Via: SIP/2.0/UDP [fc00🔢3:1:0:0:0:0]:5060;rport=5060;branch=z9hG4bK-393032-567b1c47371a83386f685807100ab5bd
Max-Forwards: 69
Contact: "alice" sip:alice@[fc00🔢3:1:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org
User-Agent: Jitsi2.10.5550Linux
Content-Type: application/sdp
Content-Length: 910
P-Asserted-Identity: sip:alice@ims.mnc001.mcc001.3gppnetwork.org
X-RTP: mo

3. The SCSCF sent to ICSCF:

INVITE sip:bob@ims.mnc001.mcc001.3gppnetwork.org SIP/2.0
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:47];lr=on;ftag=94b2833a;did=991.b322
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:45];lr=on;ftag=94b2833a;nat=yes;did=991.9181
Call-ID: 0b23b2ee62c061ae9f3cc1569b7824b3@0:0:0:0:0:0:0:0
CSeq: 1 INVITE
From: "alice" sip:alice@ims.mnc001.mcc001.3gppnetwork.org;tag=94b2833a
To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:47];branch=z9hG4bK0d1b.3b5263a0a9b70cdde23243c3423be371.0
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:45];branch=z9hG4bK0d1b.9247221bd3cd63299ff9b3e1486a94e0.0
Via: SIP/2.0/UDP [fc00🔢3:1:0:0:0:0]:5060;rport=5060;branch=z9hG4bK-393032-567b1c47371a83386f685807100ab5bd
Max-Forwards: 68
Contact: "alice" sip:alice@[fc00🔢3:1:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org
User-Agent: Jitsi2.10.5550Linux
Content-Type: application/sdp
Content-Length: 910
X-RTP: mo
P-Asserted-Identity: sip:alice@ims.mnc001.mcc001.3gppnetwork.org

4. Then ICSCF sent it to SCSCF:

INVITE sip:bob@ims.mnc001.mcc001.3gppnetwork.org SIP/2.0
Route: sip:scscf.ims.mnc001.mcc001.3gppnetwork.org:5060
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:47];lr=on;ftag=94b2833a;did=991.b322
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:45];lr=on;ftag=94b2833a;nat=yes;did=991.9181
Call-ID: 0b23b2ee62c061ae9f3cc1569b7824b3@0:0:0:0:0:0:0:0
CSeq: 1 INVITE
From: "alice" sip:alice@ims.mnc001.mcc001.3gppnetwork.org;tag=94b2833a
To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:46];branch=z9hG4bK0d1b.acefb88ca4d295d2bd315467f0670d7f.1
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:47];branch=z9hG4bK0d1b.3b5263a0a9b70cdde23243c3423be371.0
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:45];branch=z9hG4bK0d1b.9247221bd3cd63299ff9b3e1486a94e0.0
Via: SIP/2.0/UDP [fc00🔢3:1:0:0:0:0]:5060;rport=5060;branch=z9hG4bK-393032-567b1c47371a83386f685807100ab5bd
Max-Forwards: 67
Contact: "alice" sip:alice@[fc00🔢3:1:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org
User-Agent: Jitsi2.10.5550Linux
Content-Type: application/sdp
Content-Length: 910
X-RTP: mo
P-Asserted-Identity: sip:alice@ims.mnc001.mcc001.3gppnetwork.org

5. Then SCSCF sent it to the PCSCF of the callee:

INVITE sip:bob@[fc00🔢3:2:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org SIP/2.0
Record-Route: sip:mt@[FC00🔢1:0:0:0:0:47];lr=on;ftag=94b2833a;did=991.b322
Route: sip:term@pcscf.ims.mnc001.mcc001.3gppnetwork.org:5060;nat=yes;received=sip:FC00🔢3:2:0:0:0:0:5060;lr
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:47];lr=on;ftag=94b2833a;did=991.b322
Record-Route: sip:mo@[FC00🔢1:0:0:0:0:45];lr=on;ftag=94b2833a;nat=yes;did=991.9181
Call-ID: 0b23b2ee62c061ae9f3cc1569b7824b3@0:0:0:0:0:0:0:0
CSeq: 1 INVITE
From: "alice" sip:alice@ims.mnc001.mcc001.3gppnetwork.org;tag=94b2833a
To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:47];branch=z9hG4bK0d1b.da418b33c49aee4296db5cf6393c2c36.0
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:46];branch=z9hG4bK0d1b.acefb88ca4d295d2bd315467f0670d7f.1
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:47];branch=z9hG4bK0d1b.3b5263a0a9b70cdde23243c3423be371.0
Via: SIP/2.0/UDP [FC00🔢1:0:0:0:0:45];branch=z9hG4bK0d1b.9247221bd3cd63299ff9b3e1486a94e0.0
Via: SIP/2.0/UDP [fc00🔢3:1:0:0:0:0]:5060;rport=5060;branch=z9hG4bK-393032-567b1c47371a83386f685807100ab5bd
Max-Forwards: 66
Contact: "alice" sip:alice@[fc00🔢3:1:0:0:0:0]:5060;transport=udp;registering_acc=ims_mnc001_mcc001_3gppnetwork_org
User-Agent: Jitsi2.10.5550Linux
Content-Type: application/sdp
Content-Length: 910
X-RTP: mo
P-Asserted-Identity: sip:alice@ims.mnc001.mcc001.3gppnetwork.org

In the last invite message, there is sip:FC00🔢3:2:0:0:0:0:5060 which doesn't have [ ] and probably cause this issue.

Any thoughts?

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