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Welcome to Cisco Support Community. We would love to have your feedback.

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New Member

Problem with SPA 2102

Can anybody help me? I have a VOIP adapter SPA 2102 that was working fine with my ADSL connection. My ISP change my router to a Fiber Optic Router. Since then I can´t dial number and I can´t hear nothing. I can get tone and the phone rings when someone is calling... please help.

3 REPLIES

Problem with SPA 2102

If the phone rings, the SIP signaling is ok but if you don't have audio, there is a NAT issue.
Wath is the model of your ADSL router? And the model of new optical fiber router?
Can they support ALG feature?
ALG means Application Layer Gateway. An ALG router is able to adjust the SIP signaling to workaround the NAT issue.
Do you have open a trouble ticket to your provider?

Regards.

New Member

Problem with SPA 2102

The model of the optical fiber router es ONT HG850 and the router its a comtrend 5813. I have reported the issue to both the ISP and the VOIP provider and they don´t have an idea... thanks

Problem with SPA 2102

The Huawei ONT HG850 is an ALG router:

Support simple routing function (PPPOE/DHCP Server/NAT/ALG)

Ask to your provider to enable/disable SIP ALG function.

Regards.

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