connecting phones to Cisco 3810 with AVM installed

i just bought a used MC3810 router that has an AVM installed with 6 rj11 ports... one is labeled FXS, one is FXO and one E&M... what do these mean and what do i need to do to hook phones up to it? i just want the phones to call each other internally

thanks
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MaestroDTAsked:
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Istvan KalmarConnect With a Mentor Head of IT Security Division Commented:
FXS: You able to connect a Phone
FXO: You able to connect this port to telephony provider analogue interface
E/M: You able to connect this port to a phone system which incuded this type of port....
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MaestroDTAuthor Commented:
so can i change the port designations, switch two phones to FXS and have them call each other?
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MaestroDTAuthor Commented:
anyone?
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MaestroDTAuthor Commented:
also i want to add that it had IOS version mc3810-i-mz-212-5.T9.bin and did not seem to recognize the phone interfaces. what IOS can I put on it? I tried loading one that I think has voice on it but I guess it was too big because it kept saying "unexpected end" when loading it....

is there a smaller one that will support the voice and t1 module? I only have like 40MB of RAM, or am i going to have to upgrade the RAM? i'm kinda in the dark here
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Istvan KalmarConnect With a Mentor Head of IT Security Division Commented:
Yes, they able to call each other (on individual ports), if you connected via FXS!

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MaestroDTAuthor Commented:
well i'll have to get another FXS module then, but most importantly i don't seem to be able to get the IOS to load. the one that it came with didn't recognize the cards at all... i just installed one that errored out repeatedly... will try another one in a moment. kind of frustrated
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Istvan KalmarHead of IT Security Division Commented:
Please tell:

sh ver
sh diag

the cisco part number the module
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MaestroDTAuthor Commented:
i can't do any of that... i can't find a working IOS. everyone I try loading , I first get an error "unexpected end of file" then it reloads and starts printing the following:

c54x_state_readyWARNING: DSP type unknown & defaulted to C542
c54x_state_readyWARNING: DSP type unknown & defaulted to C542
c54x_state_readyWARNING: DSP type unknown & defaulted to C542

it prints that so fast on the screen i can't input any commands. over and over again. this is the 3rd IOS I have now tried.
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Istvan KalmarHead of IT Security Division Commented:
Hi, I answered the question!
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MaestroDTAuthor Commented:
sorry i took so long to close this! thanks!
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