the problem voip with cisco 1750 router

[j_rios]

Hi , all

i have a problem whit the cisco 1750 router .

when I begin two calls at the same time telefonias, they gasp the interfacez of voice, I lose the tone, and router envia this mensage.

%C54X-1-NO_RING_DESCRIPTORS: No more ring descriptors availabl

e on 0 slot.

[benng]

Sounds like CSCdr29267 and few other bugs in IOS.

What version of IOS are you running? Upgrading to the latest 12.1(5)T or 12.2 should help.

-ben