Troubleshoot VoIP/SIP Deskphone Issues

@farooqtahir2013

As a Network, Cybersecurity, VoIP and System Engineer with a decade of industry experience, I've worked extensively in the VoIP/SIP realm and have successfully resolved numerous configuration issues similar to the one you're facing. In relation to your specific project needs, I have set up physical SIP desk phones with other platforms like GoHighLevel and ensured both incoming and outgoing calls functioned correctly. In line with delivering best-practice solutions, I have an expansive skill-set that includes Network administration, VOIP (including FreePBX, 3CX, Vodia, Asterisk and Cisco CUCM,CME), Linux system administration and Cloud Computing prowess (Google, AWS etc.), all of which should prove instrumental in troubleshooting and resolving this specific problem for you. What sets me apart is my dedication to delivering a 100% project delivery rate within your specified time frame. My availability ensures quick response times whenever you need me. I aspire to bring my expertise to bear on your current predicament while upholding professionalism that guarantees utmost satisfaction. Give me the opportunity to show you why employing my services will make all the difference in resolving your SIP phone troubles.

@arodrigue

I know those phones very well and I have worked solving a similar issue , so I def can help you with these phones.

@tejoel

Hello, I’m a Full-Stack Developer with over 10 years of experience in VoIP, Asterisk, and telecommunications. I have extensive experience troubleshooting NAT-related issues in different network environments

@gotucat

Hi, I reviewed the VoIP/SIP deskphone issue where two different phones register and can make outbound calls, but neither rings on inbound calls with GoHighLevel. I’ll troubleshoot the SIP inbound path end-to-end, focusing on Asterisk PBX-style signaling behavior, SIP transport expectations, and Linux-based log and network checks to identify where inbound requests stop reaching the desk phones. I’ll validate NAT/keep-alives, confirm inbound routing and extension/deskphone assignments, and help align GoHighLevel inbound settings with SIP responses for reliable ringing. Let’s discuss here now.

@maxscender

This issue is a classic SIP signaling mismatch, not a hardware fault. The phones register and send calls, but the inbound INVITE from GoHighLevel is likely arriving on a different port or transport protocol than the phone is listening on. The fix is to force the phone's local SIP port to match the port registered with the server and to set the transport to UDP, ensuring the network's NAT session for the SIP signaling stays open for the inbound request. I will align the phone's local RTP and SIP ports with GoHighLevel's expected configuration to guarantee the server's response is routed back to the correct socket.

@binayatri

Hi, The fact that two different SIP phones register and can make outbound calls strongly suggests the issue is in the inbound call path rather than the hardware. I’d trace the call from the GoHighLevel number through routing, user/deskphone assignment, SIP signaling, NAT/keep-alive, and the phone’s inbound registration, then use packet/log testing to identify exactly where the incoming INVITE is being lost. I have 13+ years of experience with APIs, networking, VoIP/SIP-related integrations, Linux systems, troubleshooting, and production automation. I’m comfortable working through the configuration systematically rather than replacing more phones or guessing at settings. I’d start with the GoHighLevel inbound test call and SIP traces, then verify the routing and registration behavior on both phones. Once the cause is identified, I’ll make the smallest required configuration change and test inbound and outbound calls end to end. Let's connect and get started soon. Best regards, Binaya T.

@naminghn

Hi there, I see that you're facing issues with incoming calls on the VoIP/SIP desk phones integrated with GoHighLevel. This sounds like a configuration problem with the GoHighLevel system rather than a faulty device issue. I can help you troubleshoot the inbound routing, SIP settings, and NAT configurations to ensure both phone models function correctly for incoming calls. Additionally, I will verify the routing rules and any IVR or forwarding setups that might interfere with the call flow. Your satisfaction is my priority, and I guarantee that I will deliver you high-quality results. Regards, Ali

@installerpoint

Good Day! I have carefully analyzed your project and can troubleshoot the GoHighLevel SIP setup to identify why inbound calls are not reaching either desk phone despite successful registration and outbound calling. I’ll systematically check inbound routing, SIP/NAT behavior, keep-alive settings, user/number assignments, and call-flow configuration to get both incoming and outgoing calls working reliably. I am eager to contribute my expertise and deliver top-notch results for your project. Let's discuss the project further in chat or let's have a quick call! Best regards, M Adeel.

@raphaelokekeze

The fact that both the Grandstream GXP2170 and Polycom VVX 311 successfully register and place outbound calls—yet completely fail to ring on inbound calls—clearly points away from faulty hardware and straight toward a NAT traversal, port forwarding, or GoHighLevel SIP routing handshake issue. I have a strong technical foundation with years of hands-on experience troubleshooting complex network configurations, SIP signaling, and VoIP setups. Because two completely different phones are exhibiting the exact same behavior, the root cause is likely hidden in the keep-alive intervals, UDP timeouts on the firewall, or the specific inbound routing payload hitting your network from GHL. I can step in, analyze the SIP traffic, trace the NAT mapping, and get your physical desk phones ringing for inbound calls without constant back and forth. My bid is $119.57 with a 1-day delivery. Let's get this fixed—reach out so we can start troubleshooting right away.

@mahads31

As a tech-savvy problem solver and a specialist in VoIP/SIP, I bring the skills and expertise you're looking for to troubleshoot the issue you're facing with your VoIP/SIP desk phones. Leveraging my profound experience of setting up and configuring similar systems, I am confident that we can identify and resolve the issue that is causing your desk phones to fail in ringing for incoming calls. Over the years, I have worked on complex technology integrations and system architecture ensuring long-term reliability and efficiency. Operating seamlessly with various APIs and automating workflows, I'll audit your current setup comprehensively ensuring all critical aspects like SIP, NAT, GoHighLevel's inbound routing are scrutinized and optimized for smooth functioning. Restoring easy access to your incoming calls through your desk phones is essential for seamless business communication. With this task at hand, I commit to providing you with an effective solution skillfully tailored to your specific needs. Let's prioritize your customers by retrieving these calls - they deserve a dependable connection! So trust me, because proven technical proficiency combined with uncompromising commitment is what guarantees success!

@FizzaNadeemK

Hello, I understand two different SIP desk phones can successfully register and make outbound calls through GoHighLevel, but neither phone receives incoming calls. This strongly points toward inbound routing, SIP, NAT or GoHighLevel configuration rather than a hardware issue. 1️⃣ Audit GoHighLevel inbound call routing and user assignment 2️⃣ Verify SIP deskphone and Ring All settings 3️⃣ Check NAT, registration and Keep Alive configuration 4️⃣ Review IVR, workflows, forwarding and Voice AI conflicts 5️⃣ Run GoHighLevel inbound test calls and troubleshoot SIP signaling 6️⃣ Confirm reliable inbound and outbound calling on both phones I can start immediately and systematically trace the inbound call path to identify the actual cause, then test the configuration until incoming calls ring correctly. Best Regards, Fizza

@amadorjay

Hi there, The hard part is not just configuring the phones; it’s ensuring that the inbound routing and NAT settings are correctly aligned with GoHighLevel. Since both desk phones exhibit the same issue, the root cause likely lies in the configuration rather than the devices themselves. I can help analyze the SIP settings and check for any potential misconfigurations in GoHighLevel’s inbound call handling. Specifically, ensuring that the NAT settings and SIP ALG are correctly configured might be crucial here. Have you verified the network settings to rule out any firewall or router interference that might be affecting the incoming call routing? Looking forward to discussing the details in chat.

@nintysix96

The bid amount and timeline above are rough placeholders. We'll firm up the real numbers once we've had a quick look at the setup. This is a classic "outbound works, inbound doesn't ring" SIP pattern, and we've seen it before. Both phones registering fine rules out credential or provisioning issues. The fact that two completely different devices behave identically points squarely at something between GoHighLevel's inbound routing and the network layer, most likely NAT, SIP ALG, or how GoHighLevel resolves the registered contact when it tries to push an inbound INVITE. Success here means physical desk phones ringing for every inbound call, no cell phone forwarding needed. Here's how we'd approach this: - NAT and SIP ALG audit: Check the router/firewall for SIP ALG and disable it if present. SIP ALG rewrites contact headers and is the single most common reason outbound works but inbound INVITEs never arrive at the phone. - STUN/RPORT configuration: Verify that both the Grandstream GXP2170 and Polycom VVX 311 are sending correct RPORT and STUN responses so GoHighLevel's SIP server knows the real external IP and port to target on inbound. - GoHighLevel inbound routing trace: Walk through the inbound call path inside GHL, including the SIP REGISTER contact address GHL stores versus where it actually sends the INVITE, and confirm no IVR or workflow is silently intercepting before the desk phone leg. - SIP packet capture: If the above don't resolve it, run a quick Wireshark or sngrep capture to see whether GoHighLevel is even sending the INVITE to the phones and what response (or silence) it gets back. Once we've confirmed the fix is solid and both phones are ringing cleanly, we can document the working config so it's repeatable if you add more phones later. Want to jump on a quick call this week so we can get eyes on the actual SIP logs and router config? Best, 96 Studio

@richardb063

Hi, I’ll start by tracing GoHighLevel inbound routing, SIP signaling, NAT, and deskphone registration behavior. Fixing inbound ringing while preserving the already-working outbound calls on both Grandstream GXP2170 and Polycom VVX 311 is the goal. I’ve handled builds where SIP phones registered correctly and outbound worked, but inbound INVITEs failed because of routing, NAT, contact registration, or PBX-side configuration. I’ll verify the GoHighLevel user and number routing, deskphone settings, SIP registration/contact details, OPTIONS keep-alive, inbound test calls, and whether the INVITE actually reaches each handset. I’d like to win this project and I’m confident I can isolate the failure rather than randomly changing settings until the phones decide to cooperate. Thanks.

@davidromano7859

Hello, I understand you're facing a challenging issue with two different SIP desk phones not ringing for incoming calls on GoHighLevel, despite successful outbound calls. Given my expertise in VoIP/SIP and experience with GoHighLevel integrations, I can thoroughly diagnose and resolve your inbound call routing or configuration problems. I will carefully review your current setup, including NAT, SIP settings, and GoHighLevel inbound routing, to identify and implement the precise fix needed. Your detailed notes will guide an efficient resolution, ensuring both incoming and outgoing calls function flawlessly on your physical SIP desk phones. I look forward to helping you get this critical communication aspect fully operational again. Best Regards, David

@Aqsa4400

Hello, I have thoroughly reviewed your project description regarding the VoIP/SIP desk phone issues you are facing with GoHighLevel. It seems that despite successfully registering the phones and making outbound calls, the incoming calls are not getting through. This could potentially be a configuration issue related to inbound routing, SIP, NAT, or desk phone setup within GoHighLevel. With over 5 years of experience in GoHighLevel, I am well-versed in setting up and troubleshooting VoIP/SIP desk phones. I have successfully resolved similar issues in the past and am confident in my ability to address the challenges you are currently experiencing. To get a better sense of my skills, please visit my portfolio: https://www.freelancer.pk/u/Aqsa4400 I would be more than happy to discuss this further with you. Please start the chat so we can delve into the specifics of the problem and find a suitable solution. Best regards, Aqsa Usman

@faizanzaferjut

Hi, I see the issue with both Grandstream and Polycom SIP phones not ringing for GoHighLevel inbound calls. I’d start by checking SIP traffic logs on Asterisk to confirm if INVITE requests are reaching the PBX, then validate NAT settings, STUN configuration, and GoHighLevel’s SIP URI format. I configured a SIP trunk with GoHighLevel for a CRM integration last year, resolving one-way audio and registration failures by adjusting transport protocols and auth headers. Happy to chat if you’d like to walk through the logs or settings.

@brazenest

Hi, I see you're troubleshooting GoHighLevel SIP deskphones that won't ring on incoming calls. I'd start by verifying SIP headers, NAT traversal settings, and GoHighLevel's inbound call routing rules to isolate where the signal is dropping. I configured a Polycom VVX 300 for GoHighLevel with working inbound/outbound calls, resolving a similar no-ring issue via correct transport settings and call group configuration. Happy to chat about testing SIP traces or config checks.

@millz

Hi, Your checklist is all GoHighLevel side, but two different phones failing identically points at the network layer, not the config. Registration succeeding only proves the outbound path works. Inbound needs the INVITE to find its way back, and that's where these die. Two usual causes. First, the phone advertises its private LAN IP in the REGISTER Contact header, so GHL sends the INVITE to an address that doesn't exist on the internet. Outbound is unaffected because the phone initiates. Second, SIP ALG on the router rewriting SIP headers badly, which is a known killer on consumer and small business firewalls and breaks inbound while leaving outbound fine. Related third: if the NAT UDP binding times out faster than the re-register interval, the pinhole closes and the INVITE hits a wall, which is what OPTIONS keepalive is meant to solve but only if the interval is short enough. How I'd work it: tcpdump or Wireshark on the LAN to see whether the INVITE arrives at all. That single capture splits it cleanly into a GHL routing problem or a NAT problem, and no more guessing after that. Then fix, verify both phones ring, and send you a short writeup of what it was. 15 years Linux, networking and infrastructure, including HA systems and datacenter server admin. Can start today, most likely fixed in one session. $30. What router or firewall is in front of the phones? Karol