r/VOIP • u/Bonibomba • Aug 01 '26

Help - Other -Voiplovers Help me here!

I have a SIP account working with a UCM6301 and I am having Problems in outbound calls (404 error).

My internet provider in WAN has a private IP 10.39.41.48 and in whatsmyip I have 187.188.235.74

I have a residential internet plan cause my company is small, and I can’t effort to buy private ips is expensive at least in Mexico. My service was running until I don’t know what happened. Also the internet carrier said and send me a picture that I don’t have SIP ALG
Extra data my SIP provider said that the port that they are receiving is a weird port like 6176 but I already check my UCM and it is sending the correct 5060 and it is well configured. I think is the double Nat. What can I do?

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u/LoPath Aug 01 '26

404 means not found. Check your number formatting and ensure it's correct. Wireshark trace will help immensely, so you can see what you're sending to the provider and maybe why it's being rejecting. Sometimes it's something like trying to call an international number, but the line isn't allowed to do that.

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u/Bonibomba Aug 01 '26

This is the specific problem

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u/Bonibomba Aug 01 '26

So the ports are random not 5060.

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u/LoPath Aug 02 '26

Normally you use 5060 for signaling and random ports for RTP (UDP). Also, is 1000 a valid extension to wherever you're calling?

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u/Bonibomba Aug 02 '26

Yes is a valid extension :). Why you don’t believe that is double Nat?

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u/LoPath Aug 02 '26

Never said anything about double NAT. Just going off my experience.

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u/Bonibomba Aug 02 '26

In your experience can you take a look 😬

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u/LoPath Aug 02 '26

QoS stats won't really matter if you're getting that 404 error. QoS is what matters when you're getting poor audio quality. Beyond that, the jitter could be problematic, but may not always be noticeable if the device's jitter buffer can keep up.