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

[Yura Monchak]

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