Sylvia called back after hearing Shortfang call, "Yeah! I can hear you!" She listened to what Shortfang had to say. After Pylia tried saying the literal phrase, Sylvia took a solid minute to think, staring at the inscription of the sesame seed with squinted eyes. 

Then the realization came to her, like a bolt of lightning. Her eyes widened. And she couldn't help but laugh raucously! 

"Oh my god! I get it! Whoever made this door is a fan of 'A Thousand and One Nights'!" After laughing a bit more, getting it out of her system, she cleared her throat, and called 

"Open Sesame!"