To answer your questions:
When I configure the command "ip rsvp bandwidth 40" on the subinterface, it is also automatically configured on the Main Serial Interface as well (just without the value). Why is it so?
All interfaces that voice may traverse need the ip rsvp bandwidth statement, since this is a sub-interface the main interface will need it too.
When I issue the "show ip rsvp interface" command, it shows me that the RSVP Bandwidth for Frame Relay subinterface (0/3/0.1) is 40 kbps, and Serial interface RSVP bandwidth is 96 kbps.
RSVP, by default, automatically will allow reservation of up-to 75% of an interfaces bandwidth unless you say otherwise. 96 kbps is 75% of your 128kbps frame relay connection.
As you can see, I have configured only 40 kbps for IP RSVP Bandwidth on subinterface, so that only one G729 call should be allowed, but when I am testing it, up to 4 calls can be made, the the RSVP is somehow reserving the bandwidth for all 4 calls (I did not test more calls). Why it is doing so? Locations are configured with "Mandatory (Video desired)" option.
Couple of reasons why this could be occuring. The obvious one is that the aforementioned 96 kbps on Serial 0/3/0 is allowing four G.729 calls as each call is 24K you can fit exactly 4 calls into 96kbps (24*4 =96). Set your ip rsvp bandwidth statement to be 40 on the main serial interface.
The other reason is that you may not have enabled rsvp policy preemption. Add the global command "ip rsvp policy preempt" to your router so that CUCM can preempt RSVP reservations. It is also a good idea to disable the actual 'reservation' of bandwidth on the interface and just let the RSVP sub-system only 'track' the bandwidth used by voice calls. Add the following commands to each interface that has ip rsvp bandwidth.
ip rsvp data-packet classification none
ip rsvp resource-provider none
There is also a great Cisco Voice of the Engineer recording all about RSVP call agent.
https://cisco.webex.com/ec0605lc/eventcenter/recording/recordAction.do;jsessionid=jpR7TyGJpB3nTrkD1W3YSJjchg1Kgxqht3fhzdMXgqQF23wxHkvN!-2072492621?theAction=poprecord&actname=%2Feventcenter%2Fframe%2Fg.do&actappname=ec0605lc&renewticket=0&renewticket...
-Steven
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