[Serusers] Loop with Moved Temporarily

[Zappasodi Daniele]

Suppose this simply scenario: 3 SIP phones A,B,C.
On B is set a redirection (moved temporarily) direct to C. 
On C is set a redirection (moved temporarily) direct to B. <?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

 If A calls B and B replies with moved temporarily to C.

A   INVITE B
A ---------a B

B   “Moved temporarily to C”
A s--------- B 


A calls C and B replies with moved temporarily to B.

A   INVITE C
A ---------a C

C   “Moved temporarily to B”
A s--------- C

A calls B 
A   INVITE B
A  ---------a B

so it generates an endless loop. 

How can I detect and avoid this endless loops?

Does the INVITE contain an header field, analogous to the “Max Forwards”,
that I can see to identify a loop and consequently refuse the INVITE?

Thanks for your help, 

Daniele  

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