Yes. Firstly, the basic format for telephone and fax number when registering/modifying domains (applicable for all domain extensions) is +[country code].[zip code][telephone number]. For example, if your country code is 1, zip code is 415, telephone number is 6656387, then you should input +1.4156656387. The fax number format is the same. Secondly, the address should be less than 64 characters. Thirdly, the country should be chosen from the drop down menu. If you register/modify domains through API/CGI, it's recommanded to use the standarized country code.
Note, please make sure the information you input is correct, valid and accurate.
