MO-Based GSM SMS NP Call Flows
This section illustrates the sequence of messages that occur when a mobile operator delivers SMS messages in a number portability environment to:
- A called subscriber that is in the same network as the calling subscriber
- A called subscriber that is in a different network from the calling subscriber
Figure 5-9 MO-Based GSM SMS NP Call Flow for In-Network Subscriber
![img/mo_based_gsm_sms_np.jpg](img/mo_based_gsm_sms_np.jpg)
Call considerations:
- The TCAP calling party is a wireless GSM subscriber.
- The TCAP called party is a non-ported or ported-in wireless subscriber that belongs to the same carrier as the TCAP calling party.
- The call type is SMS.
- The SMSC (Short Message Service Center) has to remove the prefix that indicates that the DN (dialed number) is ported in.
- If the called subscriber is ported-in, it must be provisioned individually.
Message Flow:
- MO_SMS(B) - vSTP intercepts SMS messages after they have undergone Prepaid Short Message Service Intercept (PPSMS) and Portability Check for Mobile Originated SMS (MNP SMS) processing and decodes the TCAP/MAP message destination address.
- MO_SMS(SP+B) - If successful, modify B-party Number and relay to SMSC.
- SRI_SM(B) - Send message to HLR to find B-party.
- SRI_SM - Send message to HLR to locate B-party.
- SRI_SM Ack - HLR sends message to vSTP.
- SRI_SM Ack - vSTP routes message to SMSC.
- MT_SMS - Deliver message to in-network subscriber.
Figure 5-10 MO-Based GSM SMS NP Call Flow for Other-Network Subscriber
![img/mo_based_gsm_sms_np_other_network.jpg](img/mo_based_gsm_sms_np_other_network.jpg)
Call considerations:
- The TCAP called party is a non-ported or ported-in wireless subscriber that belongs to a different carrier from the TCAP calling party.
- The call type is SMS.
- The SMSC (Short Message Service Center) has to remove the prefix that indicates that the DN (dialed number) is ported in If the called subscriber is ported-out, it must be provisioned individually.
- If the called subscriber is TDMA, the vSTP Migration feature ensures that the message gets delivered in the TDMA network.
Message Flow:
- MO_SMS(B) - vSTP intercepts SMS messages after they have undergone Prepaid Short Message Service Intercept (PPSMS) and Portability Check for Mobile Originated SMS (MNP SMS) processing and decodes the TCAP/MAP message destination address.
- MO_SMS(SP+B) - If successful, modify B-party Number and relay to SMSC.
- Deliver_SM - Forward message or submit message other network.