SOLVED Problem with one router and one phone

[rchalk]

I have an Aastra SIP DECT system which includes the base station and a wireless handset. If I try to set this up through an Asus RT-N16 router, it will log in to the server, but only "half-Way", which is to say that it is connected for outgoing calls, but apparently not registered, as the peer status shows Unreachable, and the phone cannot receive calls.

When I switch to a Buffalo router, everything works normally, and the phone works fine.

I have used the same Asus router in several locations, with over 100 phones, and never had a problem like this. Those phones are Aastra 6757i for the most part, with a couple of 6753i and a couple of 9480i in the mix.

Anyone have any thoughts as to why this one phone is not working correctly?

Thanks for your thoughts...
Richard

 

[atsak]

Have seen this issue with the Aastra's, not sure why on that router. I fixed it by loading Tomato firmware. There's probably other ways to fix it as well.

 

[rchalk]

OK, found the problem. Asus router comes with SIP ALG enabled by default, and no setting in the GUI to turn it off. I found instructions on using Telnet, and the commands necessary, and now all is working fine.

Thanks for looking.