The concept of Mobile signature Roaming is: an Access point

Wireless access point

In computer networking, a wireless access point is a device that allows wireless devices to connect to a wired network using Wi-Fi, Bluetooth or related standards...

 (AP) should be able to get a Mobile Signature

Mobile signature

A mobile signature is a digital signature generated either on a mobile phone or on a SIM card.-Origins of the term:mSignThe term first appeared in articles introducing mSign . It was founded in 1999 and comprised 35 member companies...

 from any enduser, even if the AP and the enduser have not contracted a commercial relationship with the same MSSP

Service switching point

In telephony, a service switching point is the telephone exchange that initially responds, when a telephone caller dials a number, by sending a query to a central database called a service control point so that the call can be handled...

. Otherwise, an AP would have to build commercial terms with as many MSSPs as possible, and this might be a cost burden. This means that a Mobile Signature

Mobile signature

A mobile signature is a digital signature generated either on a mobile phone or on a SIM card.-Origins of the term:mSignThe term first appeared in articles introducing mSign . It was founded in 1999 and comprised 35 member companies...

 transaction issued by an Application Provider should be able to reach the appropriate MSSP, and this should be transparent for the AP.

Mobile Signature

Mobile signature

A mobile signature is a digital signature generated either on a mobile phone or on a SIM card.-Origins of the term:mSignThe term first appeared in articles introducing mSign . It was founded in 1999 and comprised 35 member companies...

 roaming

Roaming

In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the...

 itself requires commercial agreements between the entities that facilitate it. In this respect, we assume that various entities (including MSSPs) will join in order to define common commercial terms and rules corresponding to a Mobile Signature Roaming Service. This is the concept of a Mobile Signature Roaming Service.(reference)

Entities involved are:

• Acquiring Entity (AE): an entity performing this role is one of the entry points of the mesh, and handles commercial agreements with APs
  Wireless access point
  In computer networking, a wireless access point is a device that allows wireless devices to connect to a wired network using Wi-Fi, Bluetooth or related standards...
  
  . The entry point in the mesh may be for instance a MSSP
  Service switching point
  In telephony, a service switching point is the telephone exchange that initially responds, when a telephone caller dials a number, by sending a query to a central database called a service control point so that the call can be handled...
  
  , or an aggregator of Application Providers in the context of a particular communities of interests (e.g. payment associations, banks, MNOs etc.). That's the reason why we define this more abstract role. An Acquiring Entity implements the Web Service Interface specified in TS 102 204 [8];
• Home MSSP (HMSSP): this is the MSSP that is able to deal with the current enduser and the current transaction;
• Routing Entity (RE): any entity that facilitates the communication between the AE and the home MSSP;
• Attribute Provider: this role is described by Liberty Alliance [3]. One or several mesh
  Mesh
  Mesh consists of semi-permeable barrier made of connected strands of metal, fiber, or other flexible/ductile material. Mesh is similar to web or net in that it has many attached or woven strands.-Types of mesh:...
  
   members may undertake this role and store relevant attributes in order to facilitate the discovery of the Home MSSP by other Mesh members;
• Identity Issuer: an entity that is able to make a link between a Mobile Signature and an enduser's identity. Within a PKI
  Public key infrastructure
  Public Key Infrastructure is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a certificate...
  
   system, this is typically the CA
  Certificate authority
  In cryptography, a certificate authority, or certification authority, is an entity that issues digital certificates. The digital certificate certifies the ownership of a public key by the named subject of the certificate...
  
   and/or a RA
  RA
  RA may refer to:- Science :* Right ascension, an astronomical term* Relation algebra, a type of mathematical structure- Medicine :* Relative analgesia machine, a type of sedative* Right atrium, one of the four chambers of the heart...
  
  ;
• Verifying Entity (VE): an entity that can verify a Mobile Signature
  Mobile signature
  A mobile signature is a digital signature generated either on a mobile phone or on a SIM card.-Origins of the term:mSignThe term first appeared in articles introducing mSign . It was founded in 1999 and comprised 35 member companies...
  
  . A MSSP may be a Verifying Entity as well;
• Acquiring MSSP (AMSSP): this is a MSSP acting as an entry point in the Mesh. We can imagine that a commercial model for a mobile Signature Roaming
  Roaming
  In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the...
  
   Service is a Mesh of MSSPs which are fully or partially connected between each others.(reference)

First mobile signature roaming transactions

13.4.2005 "Finnet and TeliaSonera Finland Performed Successful MSS Roaming

Roaming

In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the...

"
(announced by TeliaSonera)

7.2.2007 "World's first international Mobile Signature Roaming - with ETSI-MSS by Valimo (Finland) and BBS (Norway)"
(announced by Valimo)