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Voice Gateway Issue

Hello Guys,

I am facing issues with voice calls in my network, I will try to put up the scenario as simple as possible,

I have a 2811 router as voice gateway which is connected to a SIP server in US through MPLS link. Our employees get calls from different customers for ordering some stuff, What happens here is if I say some 5 people are on a call they are able to communicate without any issue, but when a 6th person tries to talk his line completely blank there is no voice at all and sometimes the database connectivity which is also in US becomes slow. We have configured QOS and applied it on the MPLS connected interaface, below is the output,

class-map match-any Data1

match any

class-map match-any VoIP

match protocol sip

match protocol rtcp

match protocol rtp

match  dscp ef

class-map match-any SMACKDOWN

match protocol bittorrent

match protocol edonkey

match protocol fasttrack

match protocol gnutella

match protocol kazaa2

match protocol gopher

match protocol winmx

match protocol netbios

match protocol cuseeme

match protocol directconnect

match protocol mgcp

match protocol novadigm

match protocol pcanywhere

match protocol pop3

match protocol printer

match protocol skype

match protocol smtp

match protocol sqlserver

match protocol vdolive



policy-map MstayQOS

class VoIP

   police cir 1536000 bc 288000 be 576000

     conform-action set-dscp-transmit ef

     exceed-action drop

     violate-action drop

  priority 1536

class Data1

  set ip dscp af21

   police cir 2048000 bc 384000 be 768000

     conform-action transmit

     exceed-action drop



policy-map PARENT_WAN

class class-default

  shape average 2048000

  service-policy MstayQOS

Please let me know if there is any problem with config or any type tweaking is to be done, any advice would be helpful



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