[cisco-voip] 5300 gateway one-way voice problem

[V. Keroro]

Is it necessary to use "nat symmetric check-media-src" for this case,
since I already have a RTP proxy. Also, if it's NAT problem, all call
should be fail, but now the problem happen sometime.

Thanks for support.

2005/4/19, Yura Monchak <yurun at portaone.com>:
> Hi!
> V. Keroro wrote:
> 
> >Hi Everyone,
> >
> >  I have a one-way voice problem for my Cisco 5300. I have a 5300
> >gateway with T1 line connected to it and I user SIP SER for my VoIP
> >system.
> >
> >  The one-way voice happen frequently, about 30% of call have such
> >problem, PSTN can't hear voice of VoIP side but VoIP is able to hear
> >PSTN side. I trouble-shoot my SER and RTP proxy, both of them work
> >properly.
> >
> >  I try to reboot the Cisco gateway before, everyone I reboot the
> >Cisco gateway, it will work properly for few days but problem happen
> >again after a week.
> >
> >  I believe that there's some problem to my IOS but I'm not sure. The
> >IOS of my gateway is c5300-is-mz.123-6c.bin and the gateway have 64 MB
> >RAM. Thanks.
> >
> >Victor Chan
> >
> >
> Try to enable NAT traversal feature on your AS5300:
> sip-ua
> nat symmetric check-media-src
> 
>