[SR-Users] extra characters in re-invite "TO" field

[Al S]

Hi,
Kamailio adds extra characters in the re-invite "TO" field during session timer. There is no header manipulation in our route[WITHINDLG] block. 
Re-INVITE received by KamailioTo: <sip:8131111111@?.?.?.?;otg=1>;tag=1c1048632956
Re-INVITE forwarded by KamailioTo: <sip:8132222222@?.?.?.?;T\033\023Z\f1>;tag=1c1048632956

Your help would be greatly appreciated.
Thanks,AS 		 	   		  
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