When an internal caller (Snom m3, same for other phones) is put on hold 
by callee (Polycom IP 650, 3.2.2) the call is _not_ dropped. RTCP 
reports are being sent every 5 seconds. Music on Hold is turned off.

Calls routed through ITSP - Sipxecs - Polycom are dropped after 1 minute 
if put "on hold" (MoH is turned off). No RTCP reports are being sent to 
the ITSP. ITSP sends a "BYE" after 1 minute of "inactivity".
If MoH is enabled calls are _not_ dropped.

On the gateway we have enabled "SIP keepalive" (empty SIP message) and 
"RTP Keepalive" (Replay last sent packet).

Questions: Why does sipxecs (/Proxy/bridge?) not sent RTCP reports? Why 
does "keepalive" not work?

Thanks,

Stefan

P.S. wireshark traces are available, SIP traces as well.
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