Hi,
DNS requirements are given here
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/Guest/10_5/icg/JABC_BK_JA306F08_00_jabber-guest-install-and-configure/JABC_BK_JA306F08_00_jabber-guest-install-and-configure_chapter_010.html#JABC_TK_RFA63B3B_00
Exp C&E are required.
Ports and protocols info is here
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/Guest/10_5/icg/JABC_BK_JA306F08_00_jabber-guest-install-and-configure/JABC_BK_JA306F08_00_jabber-guest-install-and-configure_chapter_010.html#JABC_RF_P51279BF_00
Manish
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