Dear Hieu,
Yes it can be because of mismatch of cisco ios.
Try using same version ob both the routers. It should work.
I too faced the same problem.
Regards
Rajeev
Hieu Truong wrote:
> Hi all,
> I currently use two Cisco router 2611 with IOS: 12.0(3)T3, VIC 2 ports E&M.
> The VoIP works fine on these two one. Now I replace one of the Cisco 2611
by
> Cisco 3662 version 12.1(2a)XH, and restore the configuration from C2611 to
> C3662. All the setting for C3662 is the same as the previous C2611. However
> the
> VoIP can not work. After the dial, I got the strangely sound.
>
> Does anyone of you have experienced of this? Does it cause by different
IOS?
>
> Thnks.
>
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