VoIP Bricks Router

Discussion in 'Cisco/Linksys Wireless Routers' started by AsymptoticCoder, Sep 27, 2005.

  1. AsymptoticCoder

    AsymptoticCoder Network Guru Member

    I will try to ask this, although I probably won't get a response since none of my other posts ever get answered.

    I am now on my second Linksys WRT54G (probably won't buy from Linksys again) and have a ridiculous problem with VoIP. The router works fine, but as soon as I pick up my BT100, make a call, and then hang up, the router refuses to access the internet. I can access the LAN, but can never get to the WAN. Resetting does not work. Changing firmware does not work. I had to do a "hard reset" (holding down the reset button, shut off, and then turn back on while holding reset) to restore internet conectivity. This happens on both an old v1 AND a brand new v4. This setup will work fine until I decide to make another VoIP call.

    Why is this happening??? Is there any type of fix for this? Is it just that Linksys can't keep up with new technology?
  2. Toxic

    Toxic Administrator Staff Member

    is it using the full bandwidth for the call and choking the WRT54G connection perhaps? have you tried using QoS to low priority slightly?
  3. docmcse

    docmcse Guest

    I personally use a WRT54G v.1 with VOIP and have never seen this condition before. Mind you I do not have a WIFI VOIP phone, but do have both a Vonage and a SunRocket VOIP ATA connected to my router without incident. Currently I am running the Sveasoft Alchemy firmware and have QOS setup to make sure both the VOIP boxes and regular internet traffic have bandwidth to use. If this is your second router that shows this condition I would think your trouble is more likely with your ISP or possibly something wrong in the BT100 than something with the router.
  4. AsymptoticCoder

    AsymptoticCoder Network Guru Member

    That seems reasonable, but I would imagine if that were the case the solution would be to just reboot the router by cycling power. I have to do a hard reset.

    I actually had QoS set to highest priority for port 5060 on my first test. I cannot recall if I used QoS last time, but it might be worth a shot.

    I am considering trying that to see if that helps the problem. I wanted to install Alchemy anyway. Perhaps Linksys' firmware just isn't up to the traffic or something.

    The connection works fine when connected directly to the ISP and not to the WRT54G. Linksys' only suggestion was to contact Grandstream about the BT100. I will try upgrading firmware too.

    What kind of strikes me as bizarre is that an external device can "damage" the WRT54G and require a hard reset, just by sending TCP/IP packets.[/quote]
  5. will792

    will792 Network Guru Member

    I use DD-WRT on WRT54G v.2.0 and Sipura SPS-3000 ATA generates strange messages in the router's log: "<4> kernel: ip_nat_mangle_udp_packet: undersized packet". Apparently IP packets from ATAs have some flag (I think do not fragment) that is not present in other traffic. It might be a bug in the handling of this flag.

    Other than these messages my WRT54G works fine with Sipura.

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