challenges for an emergency medical service. Hatzalah is built to consider these challenges, especially with regard to Halacha (Jewish law) and communities that only speak Yiddish or Hebrew. A Jew reluctant to violate Shabbat rules when receiving medical attention may be more at ease and easily convinced of the medical urgency when the EMT or paramedic is a fellow Orthodox Jew. A woman or girl worried about physical modesty and contact may be helped by knowing that a Jewish provider will be aware of the details of her concerns, and will act to reduce the problem as much as possible. Cost In areas where the EMS charges a fee, lower income clientele lacking health insurance may have a reluctance to call for an ambulance, unless the evidence of urgency is overwhelming. A volunteer service, with less overhead costs, tends to reduce that reluctance. Hatzolah will often handle "check-out" cases, without charge. In this way, the true emergencies among those check-outs may be recognized and treated quickly, where the caller might have otherwise not sought treatment. Patient advocacy In contrast with most other EMS agencies, many Hatzalah volunteers will remain at the hospital with the patient long after bringing them to the emergency department. This is especially true during serious cases, where volunteers will remain in order to help the patient and/or their families navigate the sometimes confusing series of events that occur during an emergency. Members will stay to explain, advocate, and sometimes help make arrangements to bring in other specialists or arrange transfer to higher care facilities. Interaction with other agencies At times, there have been difficulties in dealing with outside organizations, including other first-responders. On February 20, 2013, the Federal Communications Commission granted Chevrah Hatzalah's request for a waiver to obtain calling party numbers (CPN), even when callers have caller ID blocking. Calls to 911 are exempt from CPN blocking, but calls to Chevrah Hatzalah do not go through 911. Other Hatzalah dispatch numbers, including other New York State Hatzalah groups, do not have this waiver, but some are working on it. In general, branches have excellent relations with state and local police and EMS. An example of those operating in uneven, or otherwise especially challenging situations is Catskills Hatzolah, handling the swelling summer crowd. Israel's United Hatzalah has shared its expertise with a group of Arab volunteers from East Jerusalem, to form an emergency first response unit