name: SMURF
full_form: Service and Media Reachability for Users over Restrictive Firewalls
context: with HTTP CONNECT), use port 80 or 443, and look like HTTP/HTTPS. The high level coverage and overlap of FS_FIRE and SMURF is shown in Figure 4.2 . Figure 4.2: FS_FIRE and SMURF overview and overlap While an FS_FIRE solution may or may not fulfill the SMURF requirements, a solution fulfilling the SMURF requirements also fulfills the FS_FIRE requirements (at least for 3GPP UEs). The possible outcomes from the FS_FIRE/SMURF work items are: FS_FIRE and SMURF are specified independently and therefore overlap when it comes to IMS services for 3GPP UEs. The SMURF solution is used by 3GPP UEs to access all services (both IMS and non-IMS). FS_FIRE is focused to solve the firewall traversal problem for fixed IMS UEs accessing IMS services. From the analysis it is clear that the work items are largely overlapping. In general overlapping solutions should be avoided as this increases both the work effort and the complexity. FS_FIRE and SMURF should therefore be studied together. However, it
description: SMURF (Service and Media Reachability for Users over Restrictive Firewalls) enables users to access services even with restrictive firewalls. It works within the IP Multimedia Subsystem (IMS) framework, specifically addressing the challenge of fixed IMS User Equipment (UEs) accessing IMS services across firewalls.
explanation: SMURF is explicitly described as a 'service' designed to overcome firewall limitations for accessing other services, particularly within the IMS ecosystem. This aligns with the definition of a telecommunication 'Service' entity type.
section_title: 4.2	Relationship between FIRE and SMURF
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