DB rev script for no_sipping preference

db_scripts/diff/11581.down

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+DELETE FROM voip_preferences WHERE attribute = 'no_nat_sipping';

db_scripts/diff/11581.up

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+INSERT INTO provisioning.voip_preferences (attribute, type, dom_pref, usr_pref, peer_pref, data_type, max_occur, description) VALUES('no_nat_sipping', 1, 1, 1, 0, 'boolean', 1, 'Don\'t do NAT ping for domain/user. Use with caution: this only makes sense on the access network which does not need pings (e.g. CDMA)');