Long delay from receiving INVITE from PSTN gateway and actual end client call

I was wondering if there is anyone who can assist me in some troubleshooting long delays within the mediation server. I have a lab environment which has the front end and mediation server on the same box. I also have an audiocodes MP-114 connected to two
test PSTN lines and this is configured as a trunk to the mediation server and there is two polycom IP phones within the test environment.
Now everything works - SIP invites and media but certain aspects have significant delays.
The problem is with inbound calls from the PSTN line
PSTN via Audiocodes MP-114 to Polycom phone - When I dial the PSTN number from my mobile the audiocodes sends a SIP invite to the Mediation Server within just under a second - I was able to determine this by using the syslog and to be honest that seems a
reasonable time.
Now moving onto the OCSlogger I logged the mediation and SIP logs and the mediation server is showing the SIP invite about half a second later (I am assuming some network latency clock drift etc) which again seems fine.
I then receive various logs showing TLS negotiation between ports 5061 and high ports on the server, and dial plan matching which all seems ok and this seems to take about 1 second not great but not the biggest issue However I then dont receive any message
logs for over 3 seconds until the the mediation server states "SDP Answer to Gateway, SDP is :v=0"
Then another 4 seconds go by until another tls session is negotiated and the SIP invite is sent to the lync registered polycom phone and then the IP phone starts ringing - so it appears the mediation server is not doing anything anything for 7 seconds.
Now looking at the detailed Trace logs I get three TL_ERROR from the proxysdp.cs(1417) proxysdp.cs(422) during the delay that states
TL_ERROR(TF_PROTOCOL) [0]12EC.1ED8::02/05/2014-12:22:45.305.000b07d8 (MediationServer,ProxySdpProcessor.InternalTryParseSdpT<GlobalDescription_TMediaDescription>:proxysdp.cs(1417))
(0000000003CB324D)SDP parsing error: Empty SDP offer
and then a warning
TL_WARN(TF_COMPONENT) [0]12EC.1ED8::02/05/2014-12:22:49.028.000b080e (MediationServer,ProxyCall.FinishGetOffer:proxycall.cs(4578))[57060297]
57060297Could not get MRAS candidates from the Media Relay token. Connectivity Servers List = SRV-0003.LOCAL.COM.NULL
and an error from SIPSTACK
TL_ERROR(TF_COMPONENT) [0]1298.25DC::02/05/2014-12:22:49.034.000b1d72 (SIPStack,CISIPProxy::CreateUriFromString:ISIPProxy.cpp(1333))
( 00000000002061A0 ) Exit - not a valid SIP address. Returned 0xC3E93F25(SIPPROXY_E_INVALID_URI_SCHEME)
Now the call goes though and works fine but the delay is considerable for the first ring - Has anyone got any ideas as I am stumped at the moment
Cheers
Adam

Adam, you did not mention Edge and so, I will assume one is not deployed yet. Is this the case? Do you have edge defined in topology but not physically configured? "Could
not get MRAS candidates from the Media Relay token" indicates Mediation is trying to get Media Relay address from Edge via FE, but could not.
Drago
http://www.lynclog.com

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Revision: 13647
Author:   [email protected]
Date:     2010-01-19 17:04:22 -0800 (Tue, 19 Jan 2010)
Log Message:
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Bugs:
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