Unsupported GrandStream GXV3370 intercom delay, Something call failed, no response

[Joo Hai]

Hi Support,

I have a question when I am using GXV3370 to answer call or make a outgoing call. It will have slight delay about 5-10 sec. When the next call, it will become normal.

Sometime will call failed. We are using hosted 3CX cloud pbx and registered through Grandstream GXV 3xxx model. All model with GXV 3xxx model will have slightly delay or cannot be call out. What could be the issues that causing this problem?

 

[AWS2P]

Do you use SBC on your location ?
Do you have a fast internet line?
No latency ?

 

[Joo Hai]

Hi Support,

1. No. We are using hosted 3cx Cloud Server PBX.
2. Yes.
3. Mostly of the time will delay when intercom or external call. After the first call made, the subsequest call seems will back to normal. Sound like intermittently. Sometime call will be failed and no response. No latency.

 

[Joo Hai]

Hi Support,

Attached with the activity logs

 

[Evolute IT]

Hi Support,

Attached with the activity logs

Do you have forwarded the required ports for the phone to work in STUN?

Also, are you using the GS template for this phone or manual config?

 

[Joo Hai]

Hi Support,

1. What is the required ports that need to forwarded to work in STUN? As the PBX is hosted through Cloud.

2.We are using manual config as this model does not show any GS template through 3cx website.

 

[Evolute IT]

Hi Support,

1. What is the required ports that need to forwarded to work in STUN? As the PBX is hosted through Cloud.

2.We are using manual config as this model does not show any GS template through 3cx website.

1. If you are not using an SBC, you should be forwarding ports

2. If you are a Grandstream Partner, you can request the official unsupported template that works with the GXV33xx series. Otherwise, if you are a customer, DM me.

Also, we are not part of 3CX Support Team. Only a partner who helps on the forums.

 

[Joo Hai]

Hi,

1. But some of the GXP 16xx,17xx and 21xx model through Grandstream, there is no such issues. Only GXV3xxx series is having this issues. Just not sure why will having this issues.

2. Do you mean that request official unsupported template for 3cx that work with GXV33xx series?

 

[Evolute IT]

1. GXPs and GRPs are officially supported. Meaning: 3CX and Grandstream "work together" (more than that for other brands, to be honest. GS isn't helping much here) to give a template and firmware that works perfectly together with 3CX. That is not the case for other models. That being said, port forwarding was always required for STUN phones. While they may work at first depending on the firewall brand and model, it rarely works perfectly forever.

2. DM me. I will explain. We have a template provided by Grandstream themselves for this series. While it's not supported by 3CX, Grandstream will support you for that template.