Random 'Duplicate Digit Dialing' on SPA-2102

I have a Linksys VOIPAdapter SPA-2102 which worked fine for two years but started ‘duplicate digitdialing' from mid-October this year. While it is still working perfectly for callsto and from any US/Canada number, now it always dials "double digits"randomly AFTER getting connected to an international access number(403-260-3325) and then dialing 011 to connect overseas . For example, aftergetting connected if I dial 92-51-2256684 it instead dials 922512256684or 925512256684 or 992512256684 etc. Thus the problem startsafter dialing 13 digits, while the same settings worked fine earlier for twoyears.
I have talked extensively both to my VOIP phone service provider and theInternational Dialing service provider, but both have failed to solve theproblem. The problem is not faced if I use a softphone from my computer,confirming the problem to be in the VOIP Adapter settings. I changed my phonebut that has not solved the problem. I reset the VOIP Adapter to defaultfactory settings by dialing the 73738# code from the handset and then feedingin the settings provided by my service provider (Adminlogin-Advanced-Voice-Line 1) but problem was not solved. Tried the same with877778# code but problem stayed. Downloaded the firmware from Linksys(Cisco)website and upgraded to version 5.2.10 from 3.3.5(a) but problem still there.
Can someone help, as I amunable to dial overseas since last six weeks!

If you tried the different combinations of DTMF Transmit Method and Codec settings you tried the obvious fixes.
To persue further changes, I would download the latest firmware for the SPA2102, install it and re-enter your configuration.  If you are currently running the latest firmware, I would reset the firmware to factory specifications with the IVR and re-enter your configuration.  You can download the latest firmware here:
http://www.cisco.com/cisco/web/solutions/small_business/products/firmware.html
When you send dtmf digits using the rfc2833 protocol, for each digit the protocol sends a start digit packet, then multiple packets for the digit depending on how long you hold down the key, then an end packet.  If the packets get out of sequence or lost that's when the receiving end can get an error in decoding the digit.  The packets are sent along with the voice stream packet (rtp packets).  If you made the call with XLite using the same voip provider to call the pstn number and experienced no problems whereas you consistently experienced problems with the SPA2102 then it would seem that the firmware in the SPA2102 has some difference with the XLite computer code.  As I said, by default it appears to me the XLite is using rfc2833 as a dtmf transmission method and G711u as the codec.
Several of the Betamax companies have competitive promotional rates to Pakistan.  VoipBuster is 3.0c/min, Rynga is 3.0c/min, Jumblo is 3.0c, 12voip is 3.5c/min, budgetsip is 3.3c/min, and actionvoip is 4.0c/min.  These are euro cent prices.  You could try one of these companies with your 2d line on the SPA2102.  The disadvantage here, though, is it costs 10 euros to get started which is close to $16 Canadian, they can change the rates without warning, and they offer zero customer support.
You could also try a different voip provider to call the pstn number as a test to see if that made any difference.  You can get a pay-as-you-go account with CallCentric for a $5 (US) deposit.  With CallCentric, calls to a Canadian PSTN number are 0.0198 (US) per minute. 

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