The phone sound not working, only the ringtone and alarm functions.

please help with this issue.

I have had that happen to me. A reset of the SMU fixed it.
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
and on a Power Mac G5 :
http://support.apple.com/kb/HT1436
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379

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