[EXPERTS ONLY] Fix Routing: Cudy P2 5G, DrayTek 2915 & Yeastar (AnyDesk Only)

STRICT RULES - READ BEFORE BIDDING

1. NO BEGINNERS & NO EXPERIMENTS:
If you are a beginner or looking to "experiment" and figure things out on the go, your bid will be REJECTED. You must have proven, hands-on experience with ALL of these specific devices:

Cudy P2 5G Router

DrayTek Vigor 2915 Router

Yeastar S20 PBX

We are a live production business, NOT a testing ground. If you have not actively worked with these exact models inside out, DO NOT BID.

2. THE CORE AUTOMATION GOAL (MANDATORY):
We demand a 100% seamless, automated experience for the end-user. Moving in and out of the KSA office must require ZERO manual network adjustments.

3. STRICTLY ANYDESK OR ULTRAVIEWER ONLY:
ALL work MUST be done remotely via AnyDesk or UltraViewer on my machine. No direct access, VPN credentials, SSH keys, or passwords will be handed over.

4. MANDATORY BACKUPS & ROLLBACK:
You must take full configuration backups of all devices to my local PC before making a single change.

5. MILESTONES & 7-DAY GUARANTEE:
Payment will only be released after a 7-day stability testing period to ensure no VoIP drops, audio delays, or VPN disconnects occur.

6. NO TIME-WASTING (INSTANT BLOCK):
Your bid is your final price. Do NOT send me private messages asking "Please clarify what is required" or "What is the problem?". Everything you need to know is in this document. Anyone sending these generic questions in private will be AUTOMATICALLY BLOCKED.

7. THE "READ ME" TEST (MANDATORY TO BE HIRED):
To prove you are an expert, you MUST start your proposal by answering this exact question:
"Since our KSA router is behind a 5G CGNAT, how EXACTLY will you route both the HTTP signaling (Port 443) AND the UDP RTP media streams through the VPS/Caddy/WireGuard setup to successfully link with the remote Yeastar PBX without one-way audio issues?"
Proposals that do not start with a clear technical answer will be IGNORED.

PROJECT DETAILS & TECHNICAL SCOPE

We need an expert to troubleshoot and optimize the Routing and Site-to-Site Link between Saudi Arabia (5G behind CGNAT) and Egypt.

Current Infrastructure:

KSA Site: DrayTek Vigor 2915 router cascaded behind a Cudy P2 5G router.

Egypt Site: Yeastar S20 PBX on stable Fiber. (NOTE: The Egypt connection is 100% stable. NO network modifications are needed on the Egypt side. The job is STRICTLY about fixing the routing/link from KSA to Egypt).

Cloud VPS (Contabo, Germany): Used as a relay to bypass the KSA 5G CGNAT. It runs Docker, Caddy (reverse proxy) with a No-IP DDNS.

Tunnels: WireGuard is ALREADY SET UP on the Contabo server for the site-to-site link.

The Exact Deliverables to Fix (via AnyDesk):

1. Zero-Touch Automation (VPN & Linkus):
Both DrayTek Smart VPN and the Yeastar Linkus app must function automatically and flawlessly. They must transition seamlessly whether the user is inside the local office network or outside on external mobile networks, requiring ZERO manual switching or IP adjustments from the user.

2. Uninterrupted GUI Access:
You must configure the Reverse Proxy (Caddy/VPS) and routing to guarantee stable, remote web access to the admin pages of the Cudy Router, DrayTek Router, and Yeastar PBX. This must be done without causing Port 443 conflicts with the DrayTek SSL VPN or Linkus signaling.

3. MTU Optimization:
Calculate and adjust the exact MTU/MSS values across the network to completely eliminate voice drops, packet fragmentation, and ensure absolute connection stability over the 5G CGNAT.

4. Codec Optimization:
Adjust and enforce the optimal audio codecs on the Yeastar PBX to guarantee zero voice delay (latency) across the site-to-site link.

5. WireGuard Routing Efficiency:
Restructure and optimize the WireGuard routing tables to deliver the highest possible bandwidth efficiency, lowest overhead, and smoothest traffic flow between KSA and Egypt.