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[Archive] Thompson/Alcatel Speedtouch 510/530 router - causes problems for SIP on 5060

  [KB7582] Show Article Properties


Summary:
Thompson/Alcatel Speedtouch 510/530 router - causes problems for SIP on 5060
Symptoms:
The Thompson/Alcatel Speedtouch 510/530 router has a SIP ALG (Application Layer Gateway) that intercepts packets on port 5060, possibly with the best intentions, but ends up mangling them.
Solution:

The solution is simply to telnet to the ADSL modem and remove this binding:

Example:
telnet 10.0.0.138 [or replace with the correct ip address]

Trying 10.0.0.138...
Connected to speedtouch
Escape character is '^]'.
Username : root
Password :
----------...
... welcome message trimmed
...

Unbind the SIP protocol and reboot the modem:
=>nat unbind application=SIP port=5060
=>config save
=>system reboot

To check whether the SIP protocol is bound in your modem use the following command to show the list of bindings (only showing SIP here):

=>nat bindlist
Application Proto Port
SIP udp 5060

If that line doesn't appear, everything should magically start working again.

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