Kerberos Credential Cache

[Marcel Lehner]

I'm planning to implement (porting) the kerberos-client v5 (kinit) on a SIP (IP) phone. 

Unfortunately the phone has no harddisk and I'm not very experienced with programming. 
Therefore I wanted to ask if somebody knows if there is a possibility to keep the 
kerberos credential cache in the phone memory or if I have to change the source-code?

I use a Siemens optiPoint 400 Standard SIP Phone.